Forms Data Controls :: Object Not Set Error When Updating?
Oct 17, 2010I get the error: Object reference not set to an instance of an object when i perform an update on my datalist?
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Forms Data Controls :: Binding And Updating Object Via Formview?
Mar 1, 2011I want to bind an object to a form view.
[Code]....
Now, is it possible to generate a new object on update, without getting and reading each textbox with findcontrol?
Forms Data Controls :: Update DetailsView Data By Updating Object?
Mar 23, 2010I'm using a DetailsView object to present a record from a database in table format. I'm actually using and ObjectSource object as the data source for the details view. In the object I am using as the source for the ObjectSource, I have paired properties that hold decimals. This is, I have a property called Year1 and another property called Year1Change. This for years 1 to six. The values from the Year1 properties are in a cell, whereas the change values are bound to texboxes. The code for the frontend is the following:
[Code]....
Now, as you can see in the tbYr2RtCh textbox, I have an OnTextChanged property to call an event handler. This is because I want to do two things when the text changes. The first one is to make the font in the textbox bold if the value it holds is different from the Year2 property. The second one is to change the text on tbYr2RevCh to adjust the revenue for the percentage increase in the rate. The problem I have is that I cannot access the object that is the source for the data and make those changes directly in the object, instead of having to update the database. I don't want to update the database until the client says so, but the changes should be calculated immediately. I thought about creating an method in the object that I could specify in the ObjectDataSource as the update method, but I'm still not sure how to go about it.
Forms Data Controls :: Get Error : Object Reference Not Set To An Instance Of An Object
Dec 2, 2010I have a nested gridview
i get error:Object reference not set to an instance of an object
when i try to get the text in the footer template of the inner gridview when clicking on the linkbutton!!!
[code]....
Forms Data Controls :: Error : Object Reference Not Set To Instance Of The Object
Feb 3, 2010I am using C# and VS 2008 attached with access database, where Date1 is the PKey in Text defined.
I am getting the above error when i am trying to insert it into the access database.
here is my code
aspx :
[Code]....
Code Behind :
[Code]....
Forms Data Controls :: Cannot Access Header Row Error / Object Reference Not Set To An Instance Of An Object
Jul 2, 2010I tried to get the heade row text with the following code, but it failed.
[Code]....
Error returned was "Object reference not set to an instance of an object." on this line:
[Code]....
Forms Data Controls :: Grid View OnDataRowBound Error: Object Reference Not Set To An Instance Of An Object?
Jul 2, 2010The stored proc fired to populate my grid view gets a column CasNo.The GridView has a DataBound item for CaseNo.
[Code]....
Then Why does this get null value: string caseNo = dataRow["CaseNo"] as string;
[Code]....
[Code]....
Forms Data Controls :: DetailsView BoundFields Auto Binding Not Updating Business Object On Update
Feb 18, 2010I have a DetailsView (DV) control, an ObjectDataSource (ODS) control, and a button on a page. I have 2 classes in the App_Code directory (Customer and CustomerDAO). The DAO class provides static methods for the ODS control and simply hack values in (ie...no real database selects/updates). The Customer class has 2 properties (Id and Name) and a default constructor. The page takes an ID on the querystring and determines if the DV control is in insert or edit mode. If in edit mode, it sets the SelectParameter on the ODS (id field), calls ODS.Select(), and then calls DV.DataBind(). The existing (although fake) customer is loaded and display properly when this happens. I then change the name of the Customer in the DV and click the Button to save the new data.
Everything seems to be wired up correctly as the UpdateMethod that is specified in the ODS control is called and succeeds (even in my real example with my database). The problem is that the BoundFields in the DV control have not been updated with the new values and therefore the existing values are updated in the database and my changes are lost. I have handled the OnUpdating event of the ODS and the values are still the old values. I have also handled the OnItemUpdating event of the DV control and the NewValues IOrderedDictionary still has the old values in it also. In looking at the MSDN article for the UpdateMethod, it states the following:
Parameter Merging
Parameters are added to the UpdateParameters collection from three sources:
From the data-bound control, at run time.
From the UpdateParameters element, declaratively.
From the Updating event handler, programmatically.
I am using the BoundField classes in my DV control so I would have assumed that the first bullet above would have handled the updating of values, but it doesn't appear to work with the way I am doing it. If I set the values explicitly in the OnUpdating event that is fired by the ODS control (the 3rd bullet) the right values are updated (again...even in my real database situation). It seems like my only issue is that the automatic binding that I expect from the DV control isn't working as I would expect it to. Here is the code that I have in my fake example:
[Code]....
Forms Data Controls :: Gridview Error While Updating?
Dec 13, 2010I'm working with a gridview control to update records in a table. When i try to update any record, i get this error msg that i have to declare a variable wich is already declared.Here is the error Msg:
Must declare the variable '@catUltModificacion'.
System.Data.SqlClient.SqlException: Must declare the variable '@catUltModificacion'.
Here IS the Code: [Code]....
Data Controls :: Updating Value From GridView Error
May 24, 2012I get Object reference not set to an instance of an object
cmd.CommandText ="UPDATE TB1 SET c_amt=@c_amt,c_type=@c_type,regby=@regby,dt=@dt WHERE id=@ id"; cmd.Parameters.Add("@c_amt", SqlDbType.VarChar).Value = Convert.ToInt32(((TextBox)
Gridview1.Rows[e.RowIndex].Cells[2].Controls[0]).Text);
cmd.Parameters.Add("@c_type", SqlDbType.VarChar).Value = ((TextBox)Gridview1.Rows[e.RowIndex].Cells[3].Controls[0]).Text;
cmd.Parameters.Add("@regby", SqlDbType.VarChar).Value = Session["name"];
cmd.Parameters.Add("@dt", SqlDbType.DateTime).Value = DateTime.Now.ToString("yyyy/MM/dd");UPDATE TBL1 SET c_amt='3000',c_type='E',regby='XYZ', dt='2012/05/24' WHERE id=94
by using in query analyzer i get it update but i had to put single quotes manually in date & amt ....
Forms Data Controls :: FileUpload - Getting An Object Reference Error
Aug 24, 2010I have a FormView with a FileUpload to upload an image in a database.
I keep getting an object reference error.(view code)
I am using this same script to upload the image to the database, but when I try to update the file upload I get the error.
[code]....
Forms Data Controls :: Getting Error - CS0019: Operator '/' Cannot Be Applied To Operands Of Type 'object' And 'int'
Jul 21, 2010I am moving a website to a new framework. But the old site is in vb and the new on I'm coding it in C#.
I have this line of code that I can't figure out, This is on the aspx page. It's in a datagrid as well.
[Code]....
The line that is messing up is the second to last one where it starts with </a>(<%#Math.Round....
Here is the error I get...CS0019: Operator '/' cannot be applied to operands of type 'object' and 'int'
I've tried to work around it but can't fix this
Forms Data Controls :: Error: Object Doesn't Support This Property Or Method At TheForm.submit()
Aug 2, 2010I am trying to sort in gridview however I got some error message in _dopostback function which shows "Microsoft JScript runtime error: Object doesn't support this property or method" at theForm.submit()
my user.aspx.cs shows as follows
[code]....
Forms Data Controls :: Gridview Update Not Working / Giving Null Object Reference Error?
Jan 14, 2010I have a gridview,when i do it is giving me null object reference error.
I am posting my code for your reference -
[Code]....
My gridview code is -
[Code]....
Pass Data Between Forms - Error "Object Reference Not Set To An Instance Of An Object"
Mar 3, 2010i am trying to pass data between forms.
Public selected_Month As String
Public Property Month() As String
Get
Return selected_Month
End Get
Set(ByVal value As String)
selected_Month = value
End Set
End Property
form1: where i am assigning a value
Dim my_Class As New Class1
my_Class.Month = ddl_Month.Text.ToString()
form2: where i am geting a value
Dim my_Class2 As New Class1
MessageBox.Show(my_Class2.Month.ToString())
when i run this code, i am getting error like Object reference not set to an instance of an object.
DataSource Controls :: Get Child Properties Using Parent Object Error / Cannot Access A Disposed Object
Feb 17, 2010On DBML I have two entities as Parent, Child. I am trying to assign Child class properites in a Parent.
[code]....
I am getting the following Error:
Cannot access a disposed object.
Object name: 'DataContext accessed after Dispose.'.
DataSource Controls :: Getting Error - Object Reference Not Set To An Instance Of An Object?
Jul 27, 2010[code]....
i'm having trouble because when it has no return value i get the error
Object reference not set to an instance of an object.
DataSource Controls :: Error - Object Reference Not Set To An Instance Of An Object
Jan 24, 2010im using a sqldatasource and i want it to query a table chosen from a dropdownlist, so i wrote the following in the .cs file
[Code]....
im recieving this error msg: Object reference not set to an instance of an object (pointing to the line containing the select command)
i don't know what's the problem, i tired a hard-coded statement and it worked fine!
Forms Data Controls :: Microsoft JScript Runtime Error: Object Expected After Click On Any Cells Of Grid View
Dec 28, 2010I am using the following to retrieve selected value of a gridview
protected void gvDetail_RowDataBound(object sender, GridViewRowEventArgs e)
{
gvDetail.DataKeyNames = new string[] { "ID Number" };
if (e.Row.RowType == DataControlRowType.DataRow)
{
e.Row.Attributes["onmouseover"] = "this.style.cursor='hand';this.style.textDecoration='underline';";
e.Row.Attributes["onmouseout"] = "this.style.textDecoration='none';";
e.Row.Attributes["onclick"] = ClientScript.GetPostBackClientHyperlink(this.gvIncidentDetail, "Select$" + e.Row.RowIndex);
}
}
The first time I click on any cells, it runs good, the second time i click on any cells of grid view, it prompts an error:
Microsoft JScript runtime error: Object expected
Data Controls :: Object Reference Not Set To Instance Error
Aug 18, 2015I have the following code on RowDataBound my gridview:
If (e.Row.RowType = DataControlRowType.DataRow) Then
e.Row.Attributes.Add("onkeydown", "javascript:ChangeRowColor('" & e.Row.ClientID & "')")
e.Row.Attributes.Add("onkeyup", "javascript:ChangeRowColor('" & e.Row.ClientID & "')")
e.Row.Attributes.Add("onclick", "javascript:ChangeRowColor('" & e.Row.ClientID & "')")
Dim lbl As Label = CType(e.Row.FindControl("BOD_NPRGSTA"), Label)
lbl.Attributes("onclick") = Page.ClientScript.GetPostBackClientHyperlink(GridView1, "Select$" & e.Row.RowIndex)
End If
I would use it to intercept the click on the row of GridView when I click on the Label lbl.The problem I have because when I click on the same label me "smashing" the gridview itself. (He added a blank row for no reason).
Forms Data Controls :: To Use CustomValidator In GridView Edit Mode - Getting The "Object Reference." Error
Jun 9, 2010I am attempting to use a CustomValidator control to validate a FileUpload control that is present in my Gridview's EditItemTemplate
[Code]....
I'm not calling the FileUpload control correctly, because I am getting the "Object reference..." error
Web Forms :: Session Ended - But Server Error/ Object Reference Not Set To An Instance Of Object?
Nov 15, 2010In the VS2005 environment, when I test my session to make sure the page redirects to the main page (itself) if the session is null, it works. There is no error.
The function I use for this is:
[code]....
However, when it is in the production environment in IIS 6.0, when the session has timed out, and I then do a postback by doing some slider control, I see the page reload but immediately thereafter, it throws a Server Error exception of : Object reference not set to an instance of object.
Looking at the stack trace, the event occured:
AJAXEnabledWebApplication1._Default.Slider1_TextChanged(Object sender, EventArgs e)
however, why is it that the Slider1_TextChanged event fired even even after during page_load, the page was told to do a response.direct ?? shouldn't the entire page have gone through a full-page refresh life cycle ? why did it continue on to attempt to raise the Slider1_TextChanged event?
Web Forms :: Error When Using A BasePage Along With A Master Page/ Object Reference Not Set To An Instance Of An Object
Mar 6, 2010I'm new to programming in ASP.NET, but I'm making my way through Wrox's Beginning ASP.NET 3.5 in C# and VB.NET.
I'm at a section where I'm creating a BasePage. I successfully created a BasePage by creating a new class file in my App_Code folder called BasePage.cs with the following code:
[Code]....
If I run that code everything works out fine. The page loads and all is well. But, if I try to do the same thing to a page that uses my MasterPage.master file, I get the following error:
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.
Why is that? In the example code from the book (that also uses a MasterPage.master file), everything excutes and runs just fine. But in my test, I get the above error. I've tried comparing my pages to the books included source pages, but I can't find any differences.
Web Forms :: Accessing Control In Usercontrol / Error: Object Reference Not Set To An Instance Of An Object
Apr 19, 2010In the same Code behind file I have:
// This works
Label lblTopNavBarInfo = (Label)Master.FindControl("lblTopNavBarInfo");
lblTopNavBarInfo.Text = "Currently Serving: + FirstName + " " + LastName ;
// This compiles but throws an error in the browser
LinkButton lnkBtnProductsOwned = (LinkButton)LeftNav_CustServ1.FindControl("ProductsOwned"); // The Control is visible
lnkBtnProductsOwned.Enabled = false; // Error: Object reference not set to an instance of an object.
Web Forms :: Error When Converting Session To String / Object Reference Not Set To Instance Of Object
May 7, 2015I am getting object refernce error at line:if (Session["Tax"].ToString() == "9")
protected void Page_Load(object sender, EventArgs e)
{
if (Session["Tax"].ToString() == "9")
{
lblTax.Text = Session["Tax"].ToString();
}
else
{
lblTax.Text = "0";
}
}
Is anything wrong I have done?
