Data Controls :: GridView RowUpdating - Object Reference Not Set To Instance Of Object
Oct 21, 2015
When I am executing the below code on Visual Studio 2008, then it is executing properly with out any error. But when i am executing it on Visual Studio 2012, then it showing me following error (System.NullReferenceException: Object reference not set to an instance of an object) at line 64
Why is it so?
.vb Code is below :
Imports System.Data.SqlClient
Imports System.Data
Partial Class grid
Inherits System.Web.UI.Page
Function constr() As String
Dim i As New IO.StreamReader(Server.MapPath("constr.config"))
On Edit Click, the DropDownList in the GridView brings the previously selected value.On Update Click, the error is: "System.FormatException: Input string was not in a correct format."
ddlRegionNavn.DataTextField = "RegionNavn"; ddlRegionNavn.DataValueField = "RegionID"; // from RegionNavn to RegionID
On Edit Click, the DropDownList values in the GridView is not firing and the following error shows.Object reference not set to an instance of an object. How to implement the code when having a value of type Int ?
I would like to enable/disable the field BagNo in my gridview, depending on the value of another field in the gridview called ScriptNo, when I click the edit button I get this message "Object reference not set to an instance of an object".
here is the code
Protected Sub GridView1_RowEditing(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles GridView1.RowEditing Dim row As GridViewRow = GridView1.Rows(e.NewEditIndex) If DirectCast(row.FindControl("ScriptType"), TextBox).Text = "TTA" Then
I have a dropdownlist attached to a cell when edit is selected. I am using the following code to populate the drop down list with the value that is on the row.
dlBU.Items.FindByValue((e.Row.FindControl("lblBU") as Label).Text).Selected = true;
This works famously when I have a value in the cell. It fails when the cell has not yet been populated. Is there an if then clause that if the value of e.Row.findcontrol("lblBU") is null no default value?
can you please help me to brainstorm the possible causes of this error. I've got a paged repeater with localisation bound programitcally to an sqldatasource using a stored proc. I can post code if needs be but it's rather long. I'm looking for typical causes of this error + will make note for future reference!
erver Error in '/WebSite4' Application.
Object reference not set to an instance of an object. 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.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
[Code]....
Line 233:Line 234: Repeater1.DataSource = PagedResultsLine 235: Repeater1.DataBind()Line 236: doPaging()Line 237: End Sub
My problem is I get an "Object reference not set to an instance of an object." error at runtime on the line "ddl2.SelectedValue = cat1". Ironically I got this from an example on the internet and the only difference is my Cat1 varible which has the correct value at runtime.
Protected Sub Repeater1_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles Repeater1.ItemDataBound ' display placeholder image if no imageId Dim ltrImage1 As Literal = CType(e.Item.FindControl("Image1"), Literal) Dim ltrImage2 As Literal = CType(e.Item.FindControl("Image2"), Literal) Dim drv As DataRowView = CType(e.Item.DataItem, DataRowView) If String.IsNullOrEmpty(drv("ImageId").ToString) Then ltrImage1.Text = "<img src=""images/properties/x_thumb.gif"" alt="""" />" ltrImage2.Visible = False End If End Sub
I keep getting this error Object reference not set to an instance of an object. What i want to do is when the button is clicked my panel is visible with a textbox of the id number, of the row that they clicked. by id number i mean the column id, and the number given to it by the database.
Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Dim button As Button = CType(e.Row.FindControl("button1"), Button) Dim id As Label = CType(e.Row.FindControl("id"), Label) button.OnClientClick = _ Panel1.Visible = True Label2.Visible = True Label2.Text = id.Text UpdatePanel1.Update() End Sub
I have a gridview that shows a list of questions. Only one field is editable and if the information has been edited an email is sent to a specific "destiny". All works fine but when I try to get the Question ID in my SendEmail function (using Findcontrol) I get "Object reference not set to an instance of an object." How Can I get the Question ID?
I have created an ASP page to display records for auditor review and response. The page consists of two repeaters that display 5 rows from a database at a time. for each row displayed, a RadioButtonList, containing two buttons is attached. If the second button is selected, an input text box is displayed to allow auditor comments.
My situation is that I cannot find a way to identify which row is being selected? When I select the Button that should enable the text box, I'm receiving the following error:
"Object reference not set to an instance of an object"
I'm just starting out in ASP coding and would like to know what I'm not doing right?
in my default.aspx page i have a dropdown List and a textbox with a submit button below that there are 2 listbox... and the dropdown list holds the names of the listbox
my logic here is to select an item from the dropdown list and put some text in the text box and submit the form which will add an item to the listbox selected.. but when i do this i get an error saying Object reference not set to an instance of an object. i tried to figure out the problem and found that when i remove the reference to the Site Master Page it works fine and when i undo and apply my reference back to the Site Master Page i get the same error.
