This i would like to use in edititemtemplate column: is it possible to use onprerender, i used it with datagrid, not sure with gridviews.
<asp:DropDownList id="name_add" runat="server" CssClass="TextBoxes" DataSource="<%# BindTheUserName1() %>" DataTextField="username" DataValueField="userid" OnPreRender="SetDropDownIndex">
</asp:DropDownList
Is it possible to access the value of a label and want to tweak it before it to textbox which is in edititemtemplate column.
<ItemTemplate>
<asp:Label ID="lblUnitprice" Text='<%# FormatPrice(Container.DataItem("UnitPrice")) %>' Runat="server" />
</ItemTemplate>
<EditItemTemplate>
<asp:Textbox runat="server" CssClass="TextBoxes" MaxLength="14" Columns="8" id="UnitPrice_edit" Text='<%# FormatPrice(Container.DataItem("UnitPrice")) %>' />
</EditItemTemplate>
Used onprerender a lot with dropdownlist boxes never used with textboxes.I have two currencies used in my application, want to format before i show to use.
My original understanding was that the asp.net page lifecycle is run once for all pages and controls under normal circumstances. When I attached a control during a container's OnPreRender, I encountered a situation where the control's OnInit was not called. OK, I considered that a bug in my code and fixed as such, by attaching the control earlier.
But just today, I encountered a situation where OnInit for a control seems to be called after the normal OnInit has been done for everyone else. See stack below. It seems that during the page's PreRender, the control's OnInit is called as it is being dynamically added.
So I just want to confirm exactly what ASP.NET's behavior is? Does it actually keep track of the stage of each control's lifecycle, and upon adding a new control, it will run from the very beginning?
[HttpException (0x80004005): The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.]
System.Web.UI.ControlCollection.Add(Control child) +8678663
MyCompany.Web.Controls.SetStartPageWrapper.Initialize()
MyCompany.Web.Controls.SetStartPageWrapper.OnInit(EventArgs e)
System.Web.UI.Control.InitRecursive(Control namingContainer) +333
System.Web.UI.Control.InitRecursive(Control namingContainer) +210
System.Web.UI.Control.AddedControl(Control control, Int32 index) +198
System.Web.UI.ControlCollection.Add(Control child) +80
MyCompany.Web.Controls.PageHeader.OnPreRender(EventArgs e) in
System.Web.UI.Control.PreRenderRecursiveInternal() +80
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842
I have a application which uses webparts and 1 control is also a Script Control.So my user controls are derived from System.Web.UI.WebControls.WebParts.WebPart which makes them webpartsI have everything setup and working fine as far as the personalization and webpart goes... every thing displays and works fine.Except that 1 of my control needs to do a bit of work in the OnPreRender event and it turns out that event only gets fired when a user is loged in the application
View 1 RepliesI have a user control which has html elements like <input type="button".... and i want to set its display property on preRender state.Would you please explain, what kind things i have to handle this user control? So, in this functionprotected override void OnPreRender(EventArgs e) { }
I have only EventArgs e and it doesn't have proper method or properties to bring me the html of user control.
my user controls are derived from System.Web.UI.WebControls.WebParts.WebPart which makes them webparts.I have everything setup and working fine as far as the personalization and webpart goes... every thing displays and works fine.Except that 1 of my control needs to do a bit of work in the OnPreRender event and it turns out that event only gets fired when a user is loged in the application.
Protected Overrides Sub OnPreRender(ByVal e As EventArgs)
If Not Me.DesignMode Then
Me.isloaded = True
' Test for ScriptManager and register if it exists
sm = ScriptManager.GetCurrent(Page)
[code]...
I am new to this forum as well as Visual Studio and asp.
I am connecting to an access db using Visual Studio Express 2010.
I have a dropdownlistbox that pulls names from a database. When I select a name Gridview1 gets populated. Now I want to populate Gridview2 with more data when I click 'Select' link in Gridview1 but it's not working.
I am passing name (string) and number (number) fields to the gridview2 based on the gridview1.selectedvalue property and am seeing:
Input string was not in a correct format.
how can i use multi javascript files with RegisterClientScriptInclude method in custom server controls. when i call two or more RegisterClientScriptInclude method, this method registers only one of the javascript files.
[Code]....
[Code]....
[Code]....
In my scenerio, i've a dropdownlistbox by which i want to filter, a textbox for the text to filter and two textbox for specifying from and to date.
A gridview control for displaying the filtered data and a sqldatasource control and a commandbutton called search.
The following code is used to filter the data in database and it works properly. But when i click on edit in gridview, the gridview displays no records and again when i click on search button the data is displayed on the gridview displayed with the selected row in editmode.
protected void btnSearch_Click(object sender, EventArgs e)
{
string query;[code]....
I'm attempting to use a Button's OnCommand method to handle it's click event so that the event is passed on to OnPreRender method as shown below. So basically the OnPreRender method is called upon a button click. I'm need to use the OnCommand method because I have 2 buttons.
//mark up
<asp:DataPager ID="GroupSearchResultPager" runat="server" OnPreRender="groupSearch_PreRender" >
<asp:Button ID="btnSearchUser" runat="server" Text="Search" OnClick="btnSearchUser_Click" CommandName="searchUser" />
//code behind
protected void btnSearchGroup_Click(object sender, CommandEventArgs e)
{
groupSearch_PreRender(this, e); //call groupSearch_PreRender
}
protected void groupSearchView_PreRender(object sender, CommandEventArgs e)
{
if(e.CommandName=="searchUser")
{
do stuff
}
}
However, this results in the following exception:
CS0123: No overload for 'groupSearch_PreRender' matches delegate 'System.EventHandler' So basically groupSearch_PreRender only takes an EventArg. I've tried casting as shown below but it doesn't seem to work. How else can I pass the button click event to the PreRender method?
protected void groupSearchView_PreRender(object sender, EventArgs e)
{
CommandEventArg entry = (CommandEventArg)e; //casting to CommandEventArg
if(entry.CommandName=="searchUser")
{
do stuff
}
}
I would like to use the gridview paging feature and have built a gridview with a user control. The data source has lots of columns, so to make it easier I want to return a LIST<MyObject> and just pass <Myobject> into the user control rather than all the data elements. Not sure how I access the object of the data source to bind to the control. Assume it would be during ondatarowbound.
Also, my guess is there is a better way to do this than gridview. I'd take either solution that allows me to have easy paging and pass the complete object into the user control
I have managed to place a dropdown control iniside a gridview control. The dropdown does indeed populate in each row... Question: How is it possible for the system to correctly select the text in the dropdown based on the value of the field which is driven from the database? Is it to do with the selectedvalue?
View 7 RepliesI am using lable control in itemtemplate tage in templatefield tag of gridview control for showing a field of my database .
I want if the lenght of string data is higher than 100 character the lable control doset show all of it ,
How can i set the value of literal control inside itemtemplate control of gridview from code behind ?(i am using vb.net)
View 1 Repliesi have a gridview control i added checkbox contrl dynamically but i am not getiing the reference of checkbox in button clilck event here is my code Gridvew
[Code]....
.vb code
[Code]....
The width of the gridview control got increased in the browser, Because of that I got Horizontal Scroll. I don't want to get Horizontal scroll in the browser.
Below is the code .
<table align="center" width="100%" style="table-layout:fixed;">
<tr>
<td style="width: 115px">
OR</td>
[Code].....
I currently have a gridview that has 1 column with radiobuttons. I then have a update button to update all the selected records. But what i want to do is add a step before the update. I want to add a multi-line textbox for each radiobutton selected to allow them to add notes/comments for each record before the update occurs.
Because the textbox will be large to allow them to enter the comments, i wanted to list them out seperately per record selected. Maybe a gridview is not what i need for the 2nd part, but thats the scenario and looking for suggestions on what / how to do it.
Example:
GRIDVIEW1
ID column1 column2 column3 radiocolumn
1 1111 2222 3333 Yes / No (selected Yes)
2 2222 3333 4444 Yes / No
GRIDVIEW2
ID NotesColumn
1 Texbox displays here
I am developing a usercontrol which has a gridview control in it.
Now I want to set the datasoruce property of gridview. Datasoruce will be a generic list (List<Class>).
How to do this ?
Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.
The above error occurs with gridview control , when used with template field columns with item template / and edit templates etc.
updating a row within gridview, at the time of loadiong it loads perfectly fined, but when tried to modify an existing row within gridview control, then it produces the error. Make sure the grid view control has to be a child control which manages the child table info with in a master form. to reproduce the above problem the grid view must be loading the child records info of a master within the masterform, meaning both master data and gridview data all to be managed in one single form.
I had to replace gridview control with datagrid and then it worked perfectly fine. I wasted almost 4 days of my time., there is no way we could figure out the problem. here is the full info of the problem.
Server Error in '/' Application.
Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.
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.Web.HttpException: Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.
Source Error:
[Code]....
Stack Trace:
[HttpException (0x80004005): Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.] System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +306 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Page.LoadAllState() +312 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1661
Version Information: Microsoft .NET Framework Version:2.0.50727.3603; ASP.NET Version:2.0.50727.3082
I'm trying to extend the GridView control to enable sorting and paging for any situation.
When using my control I am fetching data from a database and filling a DataSet with it, then binding the GridView upon every page load. My first question would be, is this the correct approach?
To sort the GridView I am overriding the OnSorting method which stores the sort expression and direction in the ViewState, then creates a DataView and utalises the Sort method to sort the underlying data. It then sets the Data Source to this DataView and rebinds the GridView.
Paging is handled by OnPageIndexChanging which simply sets the PageIndex property and again rebinds the GridView.
My problem is; when any control causes a postback my GridView is no longer sorted, presumably because it is persistently rebound. If I don't rebind it then the GridView is empty on postback since the data isn't automatically stored in the ViewState. I have considered saving the data source in the ViewState but I would assume that this is bad practice for large amounts of data? - also DataViews are not seralisable.
The only solution I can think of currently is to override OnDataBound and sort the data every time. This results in a double sort when paging triggers a postback which seems inefficient. Code illustration of this below,
[Code]....
I'm looking for the cleanest 'best practice' solution as this is a learning exercise more than anything else.
where i created a usercontrol that has a dropdownlist but when setting the dropdownlist selected index in the page_load it was not updating on the postbacks to the new index but first loading was ok.until i implemented the method for modifying the usercontrol in the onprerender and then it was updating the indexwhy was the control intialized to its original state without using the overidden prerender method?
View 2 RepliesI'm getting 100+ errors per day on my website with System.Web.HttpException: Invalid viewstate. The website is asp.net 3.5 running on iis6 , not running in a web-garden/web-farm , single server.Here are a few sample errors.
Machine: ML Framework Version: 2.0.50727.3603 Assembly Version: 6.5.3664.33889
Source: http://www.domain.com/WebResource.axd?d=z5VmXXoSLLpQHoPictureAlert
Exception: System.Web.HttpException: Invalid viewstate. at System.Web.UI.Page.DecryptStringWithIV(String s, IVType ivType) at
i already tried wraping all inline javascript with //<![CDATA[ //]]>
i already set enableViewStateMac to false.From looking at all the errors guessing out of the "d" paramter it seems to focus on a single usercontrol on my website.in this control i change the visiblity of div's + text in the usercontrol OnPreRender function.
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
PreparePage();
}
Can the errors be related to the usercontrol behavioral?
how to center align the column data in a gridview control in asp.net 3.5?
View 2 RepliesASP.NET 2.0 application exports GridView data to Excel2003 as shown below, but then needs to be able to access the Excel instance; to add a title row, auto-fit column widths, rename the worksheet, etc. Can anyone explain/show how to reference the Excel instance programmatically?
Response.ClearContent()
Response.AddHeader("content-disposition", "attachment;filename=MyFile.xls")
Response.ContentType = "application/vnd.ms-excel"
[code]...
How to show Group Data in the GridView Control like
ID CityName CityCode
India
1 Chennai CH01
2 Mumbai MU01
3 Delhi DE01
Srilanka
4 Columbo CO01
5 Gandi GA01