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asp.netgridviewselectedvalue

problem with gridview.selectedvalue

i have wrote a simple website with asp and have girdview in it.i want when i click on select in gridview know the index of row(primary key) so i use from girdview.selectedvalue like this in

page load

 if (str == "book")
        {
           //do some works
            if(this.IsPostBack)
            if (GridView37.SelectedValue != null)
            {
                Session["Download"] = GridView37.SelectedValue;
            }

        }

but my problem is that GridView37.SelectedValue is null forever.what is problem?

Solution

  • What I do is have a method that is called by the OnRowCommand event and within the method do:

    public void MyMethod(object sender, GridViewCommandEventArgs e)
{
    int index = Convert.ToInt32(e.CommandArgument);
    ...
}

    That gives the index of the row.