Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

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I can not delete data because my error at 5th line and error is.

Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

C#

protected void lbtnDelete_Click(object sender, EventArgs e)
   {
       var objPerson = new Person();
       GridViewRow gr = (GridViewRow)((Control)sender).NamingContainer;
       objPerson.PersonId= Convert.ToInt32(dgvPerson.DataKeys[gr.RowIndex].Values["PersonId"]);
       PersonBLL.Delete(objPerson);
       LoadPersonGrid();

   }

Posted 14-Feb-14 23:20pm

Patel Vinay V

Updated 14-Feb-14 23:41pm

Siva Hyderabad

v2

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2 solutions

Solution 1

Start by using the debugger: put a breakpoint on the line:

C#

objPerson.PersonId= Convert.ToInt32(dgvPerson.DataKeys[gr.RowIndex].Values["PersonId"]);

And when the application stops, start looking at the parts of it to find out exactly what indexes etc. you are dealing with.

There are two obvious candidates:

C#

dgvPerson.DataKeys[gr.RowIndex]

And

C#

Values["PersonId"]

But without your code running, we can't tell which is responsible - so it's over to you!

When you know which is causing the problem, it shouldn't be a major problem for you to work out why it's not valid - but that probably requires both the rest of your code, and your sample data, neither of which we have access to.

Posted 14-Feb-14 23:26pm

OriginalGriff

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Sumit_Pathak · Accepted Answer · 2014-02-14T23:39:00

Solution 2

put if condition like this

GridViewRow gr = (GridViewRow)((Control)sender).NamingContainer;
if(gr.RowIndex > 0 )
{
objPerson.PersonId= Convert.ToInt32(dgvPerson.DataKeys[gr.RowIndex].Values["PersonId"]);
}

Posted 14-Feb-14 23:39pm

Sumit_Pathak

Comments

Patel Vinay V 15-Feb-14 6:01am

Thanks for ans.
But problem is currently exist and give error in if condition.
Mines My RowIndex is > 0 .

Sumit_Pathak 15-Feb-14 6:26am

show your error

Patel Vinay V 15-Feb-14 6:40am

Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

Sumit_Pathak 15-Feb-14 6:47am

it means debug pointer is going inside the if condition.then check the row index number using add watch...

Sumit_Pathak 15-Feb-14 6:49am

what is dgvperson..? dgvperson is another gridview..am i right.?