Set Dynamic Controls So It Doesn't Throw Exception
Jun 28, 2010
I have problem with Dynamic Controls in my Wizard Steps. In one of my Steps, I create a set of text boxes and checkboxes based on values from an XML document. Now, I initialise my dynamic controls using the OnInit method of the page, but at this stage there is no xml document until that step is reached, and of course I get null exception. How do I set my dynamic controls so it doesn't throw an null exception and be able to load any xml document when that step is reached?
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Similar Messages:
Nov 3, 2010
For a Table A defined in the DB like this:
A :{ id, selfId, name,} where selfId is a foreign key refered to Table A itself.
I generated the Entity automatically like this:
A :{ string id; A self; string name,} when i update the entity in gridview Edit/Update CommandField
i got the exception:
Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Source Error:
[Code]....
Stack Trace:
[Code]....
I guess maybe this is caused by:
A is to be updated, and when the EntityDataSource construct the new A, the reference "self" is invalid at that moment. I do not want to modify my DB structure and do not want to lose the self reference, The event EntityDataSource_Updating is not triggered while the exception hit. so i can not access my entity at any time. Maybe the worst idea is deal the whole Update Procedure myself. However, is there any better workaround?
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Nov 19, 2010
I'm trying to throw the exception back to Page_Load but the throw statement causes error: ArgumentNullException was unhandled by user code. How can that be fixed? Also, I can't see Label1.Text displayed on the page after the ArgumentNullException occurs because the page is not re-load. If there is no exception, it's fine to not reload the page. How can I see the Label1.Text displayed?
protected void Page_Load(object sender, EventArgs e)
{
try
{
...do something here...
}
catch (ArgumentNullException ae)
{
System.Diagnostics.Debug.Write(ae.Message);
Label1.Text = ae.Message;
Label1.Style.Add("visibility", "visible");
}
catch (Exception ex)
{
...do something here...
}
}
protected void ImageButton1_Click(object sender, ImageClickEventArgs e)............................
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Oct 12, 2010
iam inserting record in three tables in a database, iam using begin trans , commit transaction and rollback,
i want to use throw method, if any value insert wrong, pls correct me, i want to throw the error and
its go to rollback
running = false;
int updaterec = DBmgr.ExecuteNonQuery(CommandType.Text, "update ASArrivedcontainer set billgen ='Y' where billgen ='y' and acontinerid in ("+SelValues+")");
if (updaterec > 0)
{
running = true;
DataSet BillContainerDetails = BillingDetails();
byte[] ContainerDetails = GenerateBill(DBmgr, sContainerIds, rcno,isGeneralRCNo, FetchContainerDetails, ModifyId,ref BillContainerDetails);
DBmgr.CreateParameters(6);
//string otherchargesId = obj.retriveSingleRecord("select top(1) ModifyId from ASOtherCharges");
DBmgr.AddParameters(0, "@InvoiceNo", "1","IN");
DBmgr.AddParameters(1, "@BillDate", DateTime.Now.ToString("yyyy/MM/dd hh:mm:ss tt"), "IN");
DBmgr.AddParameters(2, "@CustomerId", "1", "IN");
DBmgr.AddParameters(3, "@TotalAmount", "10000", "IN");
DBmgr.AddParameters(4, "@OtherChargesId", ModifyId, "IN");
DBmgr.AddParameters(5, "@ContainerDetails", ContainerDetails, "IN");
String BillNo = DBmgr.ExecuteScalar (CommandType.Text, "Insert into BillMaster(InvoiveNo,BillDate,CustomerId,TotalAmount,OtherChargesId,ContainerDetails) values (@InvoiceNo,@BillDate,@CustomerId,@TotalAmount,@OtherChargesId,@ContainerDetails)
Select @@Identity ").ToString();
if (!String.IsNullOrEmpty(BillNo))
{
running = true;
DBmgr.CreateParameters(4);
for (int i = 0; i < BillContainerDetails.Tables[0].Rows.Count; i++)
{
BillContainerDetails.Tables[0].Rows[i]["BillNo"] = BillNo;
DBmgr.AddParameters(0, "@Billno", BillContainerDetails.Tables[0].Rows[i].ItemArray[1].ToString(), "IN");
DBmgr.AddParameters(1, "@rcno", BillContainerDetails.Tables[0].Rows[i].ItemArray[2].ToString(), "IN");
DBmgr.AddParameters(2, "@acontinerid", BillContainerDetails.Tables[0].Rows[i].ItemArray[3].ToString(), "IN");
DBmgr.AddParameters(3, "@bflag", BillContainerDetails.Tables[0].Rows[i].ItemArray[4].ToString(), "IN");
//string value = BillContainerDetails.Tables[0].Rows[i].ItemArray[0].ToString(); ;
// string strsql = "insert into billcontinerdetail(billno,rcno,acontinerid,bflag) values(@billno,@rcno,@acontinerid,@bflag)";
String count = DBmgr.ExecuteScalar(CommandType.Text, "insert into billcontinerdetail(billno,rcno,acontinerid,bflag) values(@billno,@rcno,@acontinerid,@bflag)Select @@Identity").ToString();
if (count > 1)
{
running = true;
}
else
{
}
//running = true ;
//break;
}
DBmgr.CreateParameters(6);
for (int j = 0; j < BillContainerDetails.Tables[1].Rows.Count; j++)
{
DBmgr.AddParameters(0, "@billcontkey", BillContainerDetails.Tables[1].Rows[j].ItemArray[1].ToString(), "IN");
DBmgr.AddParameters(1, "@ratetypcode", BillContainerDetails.Tables[1].Rows[j].ItemArray[2].ToString(), "IN");
DBmgr.AddParameters(2, "@days", BillContainerDetails.Tables[1].Rows[j].ItemArray[3].ToString(), "IN");
DBmgr.AddParameters(3, "@amount", BillContainerDetails.Tables[1].Rows[j].ItemArray[4].ToString(), "IN");
DBmgr.AddParameters(4, "@level", BillContainerDetails.Tables[1].Rows[j].ItemArray[5].ToString(), "IN");
DBmgr.AddParameters(5, "@sflag", BillContainerDetails.Tables[1].Rows[j].ItemArray[6].ToString(), "IN");
// string strsql = "insert into billratedetail(billcontkey,ratetypcode,days,amount,level,sflag)values(@billcontkey,@ratetypcode,@days,@amount,@level,@sflag)";
String count = DBmgr.ExecuteScalar(CommandType.Text, "insert into billratedetail(billcontkey,ratetypcode,days,amount,level,sflag)values(@billcontkey,@ratetypcode,@days,@amount,@level,@sflag)Select @@identity ").ToString()
;
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Nov 4, 2010
I m having a datagrid and for client side events I m using Javascript. I have few other buttons in the same page.
when I click on datagrid and select, it is working fine. After that, if I click on any other button in the Page, It is directly going to global.asax and throwing exception.
If I click directly on other buttons, they are working fine. Once I click on Datagrid and try to click on other buttons, it is throwing that exception.
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Sep 3, 2010
I would like to find a way to raise an exception if the Session is written to when in readonly mode. When EnableSessionState is set to "ReadOnly", values can still be put in Session, but the next request they will not be there. This seems somewhat dangerous.
One option is to create a helper class which we alway use to access session. However, this still leaves room for a developer to inadvertently use session directly, and fall into the "readonly" trap. Is there a way to create a CustomSessionStateDataStore that sits on top of the existing session code? I could not see an obvious way, and you can't inherit from System.Web.SessionState.SessionStateStoreData directly.
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Jan 18, 2010
when my website allow user many connectionstring by text to connect database anh retrieve data. But when user define very may wrong connectionstring. So Method in DAL dataset.Fill() takes a longtime to throw exception.So mywebsite will be die.
I want to method dataset.Fill() throws exception immediately when a connectionstring wrong. How can i do that?
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Jul 25, 2010
Why can't I throw a custom exception from within an Exception? In code below, I get error msg "UnableToOpenDatabaseException was unhandled" even though I have catch statement for it. What am I doing wrong? and how to fix it?
[Code]....
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Aug 16, 2010
I was created webservice which has a Method:
[Code]....
Then, in my aspx page, i call that method in javascript, but i get a Exception message is "Authentication Failed", code below:
[Code]....
How to resolve this problem?
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Jul 27, 2010
I'm writing some code in which I need to use my own HttpResponse object to capture the output from a method on another object that takes an HttpResponse as a parameter. The problem is, this other object (which I cannot modify) calls HttpResponse.End(), which causes an "Object reference not set to an instance of an object" exception to be thrown. What can I do about this?
Dim myStringbuilder As New StringBuilder
Dim myStringWriter As New IO.StringWriter(myStringbuilder)
Dim myResponse As New Web.HttpResponse(myStringWriter)
someObject.doStuffWithHttpResponse(myResponse) ' calls myResponse.End() and crashes
Here's some more complete information about the error, thrown from the following code in a console application:
Dim myStringbuilder As New StringBuilder
Dim myStringWriter As New IO.StringWriter(myStringbuilder)
Dim myResponse As New Web.HttpResponse(myStringWriter)
Try
myResponse.End()
Catch ex As Exception
Console.WriteLine(ex.ToString)
End Try
Here's the text of the exception:
System.NullReferenceException: Object reference not set to an instance of an object.
at System.Web.HttpResponse.End()
at ConsoleApplication1.Module1.Main() in C:Documents and Settingsjoe.userLocal SettingsApplication DataTemporary ProjectsConsoleApplication1Module1.vb:line 10
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Feb 1, 2011
I am using VS 2005.My requirement is
1) on a button click, new web page(New.aspx) should open and this new web page is populating data from an xml file and if this xml file doesnot find then it should redirect to another webpage ErrorPage.aspx.
[Code]....
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Jun 23, 2010
using VS 2005,Ajax and master pages This is how i'm adding controls to placeholder
[Code]....
here is code to read value but it returns null
TextBox text = PlaceHold1.FindControl("TxtSlotName0") as TextBox;
aspx page follows
<%@ Page Language="C#" MasterPageFile="~/Admin.master" AutoEventWireup="true" CodeFile="SlotAlloc.aspx.cs" Inherits="SlotAlloc" Title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br />
<table align="center" width="50%">
<tr>
<td align="center" colspan="2">
<asp:Label ID="LblErr" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td align="right" width="50%">
<asp:Label ID="LblType" runat="server" Text="Type"></asp:Label></td>
<td style="width: 811px">
<asp:DropDownList ID="DropType" runat="Server">
</asp:DropDownList></td>
</tr>
<tr>
<td align="right">
<asp:Label ID="LblLogin" runat="server" Text="Login"></asp:Label>
</td>
<td style="width: 811px">
<asp:DropDownList ID="DropinHours" runat="server">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
<asp:ListItem>4</asp:ListItem>
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<asp:ListItem>22</asp:ListItem>
<asp:ListItem>23</asp:ListItem>
<asp:ListItem>24</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="DropInMinutes" runat="server">
<asp:ListItem>01</asp:ListItem>
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<asp:ListItem>60</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="DropInSeconds" runat="server">
<asp:ListItem>01</asp:ListItem>
<asp:ListItem>02</asp:ListItem>
<asp:ListItem>03</asp:ListItem>
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</asp:DropDownList>
</td>
</tr>
<tr>
<td align="right">
<asp:Label ID="Lbllogout" runat="server" Text="Log Out"></asp:Label>
</td>
<td style="width: 811px">
<asp:DropDownList ID="DropOutHours" runat="server">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
<asp:ListItem>4</asp:ListItem>
<asp:ListItem>5</asp:ListItem>
<asp:ListItem>6</asp:ListItem>
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<asp:ListItem>22</asp:ListItem>
<asp:ListItem>23</asp:ListItem>
<asp:ListItem>24</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="DropOutMinutes" runat="server">
<asp:ListItem>01</asp:ListItem>
<asp:ListItem>02</asp:ListItem>
<asp:ListItem>03</asp:ListItem>
<asp:ListItem>04</asp:ListItem>
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</asp:DropDownList>
<asp:DropDownList ID="DropOutSeconds" runat="server">
<asp:ListItem>01</asp:ListItem>
<asp:ListItem>02</asp:ListItem>
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</asp:DropDownList>
</td>
</tr>
<tr>
<td align="right">
<asp:Label ID="LblNoofSlots" runat="Server" Text="Number Of Slots"></asp:Label></td>
<td style="width: 811px">
<asp:TextBox ID="TxtSlots" runat="server" AutoPostBack="True"></asp:TextBox>
</td>
</tr>
</table>
<asp:UpdatePanel id="UpdatePanel1" runat="server">
<contenttemplate>
<TABLE width="80%" align=center><TR><TD align=center colSpan=4> <asp:Button id="BtnGenerate" onclick="Button1_Click" runat="server" Text="GENERATE"></asp:Button></TD></TR><TR><TD style="TEXT-ALIGN: center" width="20%">Slot Name</TD><TD style="TEXT-ALIGN:
center" width="30%">OnTime/Time period</TD><TD style="TEXT-ALIGN: center" width="20%">Time From</TD><TD style="TEXT-ALIGN: center" width="30%">Time To</TD></TR><TR><TD colSpan=4><asp:PlaceHolder id="PlaceHold1" runat="server"><br/><br/></asp:PlaceHolder> </TD></TR></TABLE>
</contenttemplate>
</asp:UpdatePanel>
<table align="center" width="80%">
<tr>
<td align="center">
<asp:Button ID="BtnSubmit" runat="server" OnClick="BtnSubmit_Click" Text="Submit" />
</td>
</tr>
</table>
</asp:Content>
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Jan 25, 2010
Inside the for loop, an exception is thrown when the child node is attempted to be created. When I replace the childNode variable with a string literal, eg "test", it works fine.
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Aug 20, 2010
I have been experiencing instances where a FormView update or insert event fails and should throw an exception, but doesn't. This seems top be related to my switch to Visual Studio 2010 Ultimate and .Net 4.0. Since the switch I have seen this problem several times. Is there something new in .Net or VS that I need to do or set to get the exceptions thrown? Other exceptions seem to work fine...it's just with FormView and SQLDataSource that I don't see them.The specific errors I don't see reported include misspelling a field name in the Select, Insert or Update commands in the SqlDataSource.
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Dec 29, 2010
Dynamic Exception handling in Saas application
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Nov 23, 2010
Im my MVC 3.0 Application, I created a helper like below;
[Code]....
And I used that helper in a linq query as below;
[Code]....
When I fire my app, it gives me the below error. LINQ to Entities does not recognize the method 'System.String GenerateURl(System.String)' method, and this method cannot be translated into a store expression. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NotSupportedException: LINQ to Entities does not recognize the method 'System.String GenerateURl(System.String)' method, and this method cannot be translated into a store expression. Source Error:
Line 43: public Blogs GetBlog(string urlstring) {
Line 44:
Line 45: return GetAll().SingleOrDefault(x => BlogUrlGeneration.GenerateURl(x.ArticleTitle).Equals(urlstring));
Line 46: }
Line 47:
İn my blog, the link will be like below; [URL] so I need to set the above urlgenerator class into lambada. How can I do that? What would it take to make that work perfectly
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Aug 23, 2010
I am creating Dynamic Checkboxlist controls and adding them to a Panel. It works well when I do
not have a Master Page configure to this webpage. Once I have a masterpage congifured.. I get a "Object Reference not set to instance of object" error on the Panel_Control.Controls.Add(Checkboxlistnew) line:
[Code]....
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Jan 1, 2010
i need to restore Database.mdf; I create a blank new database exactly the same name as the .mdf file. However, I could not restore the database.
The error message prompted was:
TITLE: Microsoft SQL Server Management Studio Express
An exception occurred while executing a Transact-SQL statement or batch.
(Microsoft.SqlServer.Express.ConnectionInfo)
ADDITIONAL INFORMATION:
Cannot open backup device 'C:inetpubwwwrootTCPSystemApp_DataDatabase.mdf'. Operating system error 32(error not found).
RESTORE HEADERONLY is terminating abnormally. (Microsoft SQL Server, Error: 3201)
click: [URL]
BUTTONS:
OK
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Mar 3, 2010
I add linkbutton controls dynamically to a panel, this works fine, but I also add eventhandlers to them like this.. AddHandler mLink.Click, AddressOf mLink_OnClick But when I click the linkbutton links, the event never happend. I have one updatepanel wrapped around some panels. What could be wrong?
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Jan 15, 2011
I have dynamic button in tab panel. I want to load a usercontrol through this button in tab panel. but it does not work!!! would some body please tell me why is that happen? I also debug my code and it works correctlly but user control does not load in tab panel.
[Code]....
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Aug 5, 2010
I want to create a dynamic, role-based tab control that doesn't trigger a postback when the user switches between tabs.
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Feb 16, 2011
I have designed a menu control in master page. But its dynamic sub menus are hide behind the images whice is in content page called home.aspx. It shows the submenus at development phase but not at hosting time. Here is my code for a menu. Is there any problem in my code. One more thing is that when I open the website in mozilla it shows every submenus not in any version of internet explorer.
<asp:Menu ID="NavigationMenu" ItemWrap="false" StaticEnableDefaultPopOutImage = "false" Orientation="Horizontal" DisappearAfter="250" runat="server" DynamicHorizontalOffset="3" MaximumDynamicDisplayLevels="3" DynamicVerticalOffset="5" StaticDisplayLevels="1">
<Items>
<asp:MenuItem Text="Home" Value="Home" NavigateUrl="~/Home.aspx"/>
<asp:MenuItem Text="Company Overview" Value="Company Overview" NavigateUrl="~/AboutUs.aspx">
<asp:MenuItem Text="About Us" Value="About Us" NavigateUrl="~/AboutUs.aspx" />
<asp:MenuItem Text="Management" Value="Management" NavigateUrl="~/Management.aspx" />
</asp:MenuItem>
<asp:MenuItem Text="Testimonials" Value="Testimonials" NavigateUrl="~/Testimonials.aspx" />
<asp:MenuItem Text="Services" Value="Services" NavigateUrl="~/FrontOfficeService.aspx">
<asp:MenuItem Text="Front Office" Value="Front Office" NavigateUrl="~/FrontOfficeService.aspx">
<asp:MenuItem Text="Billing Office" Value="Billing Office" NavigateUrl="~/BillingOfficeService.aspx">
<asp:MenuItem Text="Paperless Office" Value="Paperless Office" NavigateUrl="~/PaperlessOfficeService.aspx">
</asp:MenuItem>
<asp:MenuItem Text="Contact Us" Value="Contact Us" NavigateUrl="~/ContactUs.aspx">
</Items>
<StaticMenuItemStyle ItemSpacing="5px" HorizontalPadding="5px" ForeColor="White" VerticalPadding="2px" Font-Bold="true" />
<DynamicMenuItemStyle HorizontalPadding="5px" ForeColor="White" BackColor="Navy" VerticalPadding="2px" />
<Dynamichoverstyle BackColor="LightBlue" Font-Bold="true" />
<DynamicSelectedStyle BackColor="Green" ForeColor="Gray" />
<StaticSelectedStyle BackColor="Green" ForeColor="Teal" />
</asp:Menu>
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Aug 24, 2010
The project I'm working on allows an end-user to modify CSS code to integrate the application as best possible. Most of the CSS values are stored in a database and need to be retrieved and parsed dynamically. I setup a Style controller, and gave each stylesheet an action, and then passed the configuration data through to the View. I set the ContentType to "text/css" and then generated the stylesheets. This works fine, but the problem I'm running into is this: none of the code works in the application. I include it in the head code, but it doesn't parse in the code. An example of what I do is this:
<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<dynamic>" ContentType="text/css" %>
.element {
background-color: <%= ViewData.Model.BackgroundColor %>;
}
I include it like so:
<link href="/style/Basic" rel="stylesheet" type="text/css" media="all" />
When I include the CSS code in a partial view and include it using the ViewModel (wrapped in style tags) in an action, then everything works fine. It is when I try to parse this as a separate file when it does not work. Is there something I am doing incorrectly? Or is there some kind of glitch?
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Jul 15, 2010
I have created a user control which is inside a folder called Controls and the class is a partial class which inherits from Web.UI.UserControl. Now from my page which is one level up I just try to access the method inside the usercontrol and so trying to cast it as the type of user control. But I get build errors. It just cannot recognize that class. I get Type not defined error. But at times it has recognized the class. Dont know why it does that.
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Mar 29, 2011
I recently updated my VS2010 website project from .NET 3.5 to 4.0. Everything was working fine in the website project. Today I decided to migrate the website to a web application project as I have learned this is the best way to work in .NET. I split out all my class files into a separate class library and copied all my other content into my new project. Then I updated all the references and web.config.
When I build the class library, everything works great. The problem is happening when I try to build/debug the web application project. It is acting like all the controls are missing and it is also throwing a bunch of compile errors about the public properties I have in my master pages.
Control errors: "The name 'INSERT CONTROL NAME HERE' does not exist in the current context"
Master page errors:'System.Web.UI.MasterPage' does not contain a definition....
It is giving these errors for every single control and master page property in my entire solution.I notice when I add a new web.form to this project, it also adds a filename.aspx.designer.cs file in addition to the .aspx and .aspx.cs file. My existing files do not have these extra files since they were created in a different .NET version.
UPDATE: It seems I was missing the step where I need to right click on the new application folder and select "Convert to web application". I just did that and it seems to be a little bit better...
Now it is choking on Literals that are inside single quotes:
<div class='<asp:Literal ID="CssClassLiteral" runat="server"></asp:Literal>'>
It doesn't see this literal when it does the conversion... Is the above valid code or should I implement that functionality another way?
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