deleting a particular row in gridview using asp.net with c#

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I am deleting partiuclar row in gridview.

Run mode as follows

Waitlistid Course Batchdate
1 AFF 25 Aug 2014
2 MFA 26 Sep 2015
3 ERS 20 Mar 2012
4 ROC 19 Jul 2012

My code as follows

protected void OnRowDeleting(object sender, GridViewDeleteEventArgs e)
{

int index = Convert.ToInt32(e.RowIndex);
DataTable dt = ViewState["dt"] as DataTable;
dt.Rows[index].Delete();
ViewState["dt"] = dt;
BindGrid();
}

protected void BindGrid()
{
GridView1.DataSource = ViewState["dt"] as DataTable;
GridView1.DataBind();
}

When i delete the 4th row in gridview in row mode shows error as follows

Object reference not set to an instance of an object.

The above error shows in below line as follows

dt.Rows[index].Delete();

please help me. what is the problem in my abvoe code.

Posted 28-May-15 17:27pm

narasiman1

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[no name] 29-May-15 0:28am

I am deleting partiuclar row in gridview.

Run mode as follows

Waitlistid Course Batchdate
1 AFF 25 Aug 2014
2 MFA 26 Sep 2015
3 ERS 20 Mar 2012
4 ROC 19 Jul 2012

My code as follows

protected void OnRowDeleting(object sender, GridViewDeleteEventArgs e)
{

int index = Convert.ToInt32(e.RowIndex);
DataTable dt = ViewState["dt"] as DataTable;
dt.Rows[index].Delete();
ViewState["dt"] = dt;
BindGrid();
}

protected void BindGrid()
{
GridView1.DataSource = ViewState["dt"] as DataTable;
GridView1.DataBind();
}

When i delete the 4th row in gridview in row mode shows error as follows

Object reference not set to an instance of an object.

The above error shows in below line as follows

dt.Rows[index].Delete();

please help me. what is the problem in my abvoe code.

3 solutions

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anand vemuri · Answer 1 · 2015-05-28T19:14:00

Solution 1

C#

//see the reference below:

C#

//Single row delete

http://csharp-video-tutorials.blogspot.in/2013/03/deleting-data-from-gridview-using.html[^]

C#

//multiple rows delete

http://csharp-video-tutorials.blogspot.in/2013/03/delete-multiple-rows-from-aspnet.html[^]

Posted 28-May-15 19:14pm

anand vemuri

Mathi Mani · Answer 2 · 2015-05-28T19:53:00

The reason for the exception "Object reference not set to an instance of an object." is your dt should be null.

Always check dt is not null and has rows before deleting. Change your code to something like below, so delete is success if the conditions are met and no exception is thrown where there is no data.

DataTable dt = ViewState["dt"] as DataTable;
if(dt != null && dt.Rows.Count > 0)
{
  dt.Rows[index].Delete();
}

I hope this gives an idea of what is wrong in your code and helps solve it.

laoyingisme · Answer 3 · 2015-05-28T20:00:00

Solution 3

try to dt.Rows.RemoveAt(index)

Posted 28-May-15 20:00pm

laoyingisme