Error - Index was out of range. Must be non-negative and less than the size of the collection.

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Why this error Index was out of range. Must be non-negative and less than the size of the collection. in the line given below

GridViewRow gvrow = lnkbtn.NamingContainer as GridViewRow;

Parameter name: index

my cs code is given below

protected void lkb1_Click(object sender, EventArgs e)
    {
        LinkButton lnkbtn = sender as LinkButton;
        GridViewRow gvrow = lnkbtn.NamingContainer as GridViewRow;
        string filePath = GridView1.DataKeys[gvrow.RowIndex].Value.ToString();
        Response.ContentType = "image/jpg";
        Response.AddHeader("Content-Disposition", "attachment;filename=\"" + filePath + "\"");
        Response.TransmitFile(Server.MapPath(filePath));
        Response.End();
}

Posted 27-Feb-12 23:15pm

Janardan Pandey

Updated 27-Feb-12 23:22pm

Abhinav S

v2

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V. 28-Feb-12 5:22am

Did you debug?
What does gvrow.RowIndex contain? it should be bigger then -1. It should also be smaller then the size of DataKeys. What is the Count of DataKeys?

2 solutions

Solution 1

GridView1.DataKeys[gvrow.RowIndex].Value.ToString();

A DataKey does not seem to exist for the given RowIndex.
Debugging through your code will help you understand what could be going wrong.

Posted 27-Feb-12 23:20pm

Abhinav S

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_Q12_ · Accepted Answer · 2012-02-28T00:01:00

Solution 2

try this for a "runtime debug":
try
{
string filePath = GridView1.DataKeys[gvrow.RowIndex].Value.ToString();
}
catch (Exception exc)
{
MessageBox.Show(exc.Message);
}

Posted 28-Feb-12 0:01am

_Q12_

Comments

Janardan Pandey 28-Feb-12 6:09am

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

Ank_ush 21-Mar-13 11:25am

This solution worked as it helped me to trace the proper location of mistake.