Object reference not set to an instance of an object in form view

Question

User-1235671040 posted

Dear all

When I press a button am trying to change the form view from insert to edit mode, I got an error "Object reference not set to an instance of an object "

when I try to get the form view control in edit mode, as the following :

If FormView1.CurrentMode = FormViewMode.Insert Then

FormView1.ChangeMode(FormViewMode.Edit)

FormView1.DefaultMode = FormViewMode.Edit

End If

FormView1.DataBind()

Dim DiscDDLInsert As DropDownList = CType(FormView1.FindControl("DiscNewEditDDL"), DropDownList)

DiscDDLInsert.SelectedValue = DiscDDLInsert.Items.FindByText(DiscDDL.SelectedItem.Text).Value    'Get the "Object reference not set to an instance of an object " error

DiscDDLInsert.Enabled = True

so any suggestions

Thanks in advance

Answer 1

User288213138 posted

Hi engzezo,

Dim DiscDDLInsert As DropDownList = CType(FormView1.FindControl("DiscNewEditDDL"), DropDownList)

DiscDDLInsert.SelectedValue = DiscDDLInsert.Items.FindByText(DiscDDL.SelectedItem.Text).Value    'Get the "Object reference not set to an instance of an object " error

Please debug your code and check if you get the id of DiscNewEditDDL. If you get it, then check if all the values in DiscDDL are included in DiscNewEditDDL.

After my test, if DiscDDL.SelectedItem.Text is not included in DiscNewEditDDL, this error will occur.

If you still can't solve your problem, please post your code and DropDownList datasource.

Best regards,

Sam

Answer 2

User-1716253493 posted

If DiscDDLInsert.Items.FindByValue("abc") IsNot Nothing Then
   DiscDDLInsert.Items.FindByValue("abc").Selected = true
End

Sorry, i'm not get your logic

You should have same controlid in edit and insert template

Ensure "DiscDDLInsert" is in both template

or check what is current mode to find the control

If FormView1.CurrentMode = FormViewMode.Edit Then
    Dim DiscDDLInsert As DropDownList = CType(FormView1.FindControl("DiscNewEditDDL"), DropDownList)
End If

Answer 3

User-1235671040 posted

Dear samwu and oned_gk

Thanks both for your efforts, the problem was with Form view Sql Data Source, there was issue with the select statement.

Regards,