Repeater Control in Asp.Net?

Question

In web application using asp.net, i am using repeater control, in ItmeCommand event i am trying to find a control using fid control method, i write the code for finding the control it is working fine, when the control is not in repeater control, i am getting exception. How can i handle the exception if the control is not in repeater control. My code is like this :

if (((DropDownList)rpPendingApprovals.Items[i].FindControl "drpBack")).SelectedItem.Value != "0")

when dropdown controls is not there, in repeater then how can i handle this exception help me, thank you.

score 3 · Answer 1 · answered Jan 18 '12 at 05:50

3

why don't you do this?

var dropdown = (DropDownList)rpPendingApprovals.Items[i].FindControl("drpBack"));

    if (dropdown != null && dropdown.SelectedItem.Value != "0")

answered Jan 18 '12 at 05:50

Shoaib Shaikh

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i am getting exception Shoaib – Surya sasidhar Jan 18 '12 at 06:01
can you show me more code... how you are iterating the items? – Shoaib Shaikh Jan 18 '12 at 06:09

score 2 · Answer 2 · answered Jan 18 '12 at 05:53

2

DropDownList drpBack = (DropDownList)rpPendingApprovals.Items[i].FindControl("drpBack");

if(drpBack!=null)
{
  if(drpBack.SelectedItem.Value != "0")
    {
       // Do Whatever you want
    }
}

answered Jan 18 '12 at 05:53

Pankaj Tiwari

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Pankaj, i am getting object reference not set to instance of an object , thank you for reply – Surya sasidhar Jan 18 '12 at 06:01
I am getting the exception at if(drpBack.SelectedItem.Value != "0"), pankaj – Surya sasidhar Jan 18 '12 at 06:03
when data is not binding to dropdown list i am visibling false, if data is there i am visibling true, when no data is there in dropdown then it is giving error – Surya sasidhar Jan 18 '12 at 06:05
@Suryasasidhar: For this u need to change ur approach like if(drpBack.Items.Count == 0) { drpBack.Visible=false; } else { drpBack.Visible=true; } – Pankaj Tiwari Jan 18 '12 at 07:28
Let me know, if you have any concern. – Pankaj Tiwari Jan 18 '12 at 07:30

Mubarek · Accepted Answer · 2012-01-18T06:27:30.173

0

When you've tried Shoaib's code you are getting exception because if the drodown is not null the second expression is checked which if SelectedItem is null creates the exception so nest the expressions as

var dropdown = (DropDownList)rpPendingApprovals.Items[i].FindControl("drpBack"));

if (dropdown != null && dropdown.SelectedItem != null)
   if(dropdown.SelectedValue !="0")

problem hopefully is gone

edited Jan 18 '12 at 06:27

answered Jan 18 '12 at 06:21

Mubarek

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Repeater Control in Asp.Net?

3 Answers3