How to set value to dropdown list

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I take one gridview with linkbutton ineach row.
After clicking on link button edit it sets value to textbox properly but at the Dropdown list it give an error 'Object reference not set to an instance of an object'
My code is as follow

if (e.CommandName.Equals("EditRecord"))
               {
                   GridViewRow row = (GridViewRow)(((LinkButton)e.CommandSource).NamingContainer);
                   tbxCode.Text = row.Cells[1].Text;
                   tbxName.Text = row.Cells[2].Text;

                   ddlSection.SelectedItem.Text= row.Cells[3].Text;
                   tbxdesc.Text = row.Cells[4].Text;

                   MultiView1.SetActiveView(ViewAdd);
               }

Can anybody please help me....
Thank you...

Posted 4-Nov-15 0:31am

asplover1

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BIBASWAN 4-Nov-15 7:06am

first check what value is in row.Cells[3].Text and then check that your Dropdown list have that same value or not.

John C Rayan 4-Nov-15 7:21am

ddlSection.SelectedItem is read only property. You cannot assign a value to this property.

asplover1 5-Nov-15 0:36am

But On same page it works properly. In this case the view is changed to view2 and my dropdownlist is on view2 and grid view on view1.

John C Rayan 5-Nov-15 4:22am

When you say it works on the same page , can you show us the code for that. I am surprised that you could assign a value to a read only property.
https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listcontrol.selecteditem(v=vs.110).aspx

asplover1 6-Nov-15 3:41am

if (e.CommandName.Equals("EditRecord")) //onclick edit link button of grigview
{
GridViewRow row = (GridViewRow)(((LinkButton)e.CommandSource).NamingContainer);

tbcPrtCode.Text = row.Cells[1].Text;;
tbxPrtNm.Text = row.Cells[2].Text;;
ddlsection.SelectedItem.Text = row.Cells[3].Text;

}

This is the code which executed properly.
But here the case is the gridview and ddl are on same page.

John C Rayan 6-Nov-15 4:48am

So the following code from view1 right?
if (e.CommandName.Equals("EditRecord"))
{
GridViewRow row = (GridViewRow)(((LinkButton)e.CommandSource).NamingContainer);
tbxCode.Text = row.Cells[1].Text;
tbxName.Text = row.Cells[2].Text;

ddlSection.SelectedItem.Text= row.Cells[3].Text;
tbxdesc.Text = row.Cells[4].Text;

MultiView1.SetActiveView(ViewAdd);
}
My understanding is that the gridview in view1 and you click a button in view1 and it goes to the controller and in the controller you are trying to execute this code. But the dropdown doesn't exist in your view1. So How can you do that?

asplover1 15-Nov-15 23:06pm

Yes you got my problem.
But it assign value to textboxes only dropdown give the error

John C Rayan 16-Nov-15 1:55am

Where is ddlsection declared ?

asplover1 16-Nov-15 4:51am

In View2 i.e.ViewAdd

John C Rayan 16-Nov-15 4:59am

Better you post your controller and view1 and view2. The text boxes are in view2 too? How does the controller know about ddl and textboxes if they are not passed to the action?

asplover1 17-Nov-15 4:03am

Hey I solve my problem
Its not a fault of code.There is problem in data binding of drop drown list. Thank you

John C Rayan 17-Nov-15 6:40am

Glad you fixed it.

asplover1 18-Nov-15 4:13am

:-)

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sanjaysaraswat · Answer 1 · 2015-11-04T02:40:00

Solution 1

Have you checked the value of row.Cells[3].Text??

Posted 4-Nov-15 2:40am

sanjaysaraswat

Comments

asplover1 5-Nov-15 0:34am

Yes I check that. Its right. But give an error that object reference is not set to an instance of an object

Sanjeev Maurya · Answer 2 · 2015-11-16T01:28:00

Solution 2

Dear please fistly fill your drop down then set the dropdown value. it is giving error because of dropdown list is null

Posted 16-Nov-15 1:28am

Sanjeev Maurya

Comments

asplover1 17-Nov-15 4:02am

Thak you. I got my problem