Getting Null Reference in Gridview RowIndex

protected void lnkbtnVerify_Click(object sender, EventArgs e)
{
    try
    {
        LinkButton btn = (LinkButton)sender;
        GridView gv = (GridView)btn.NamingContainer.NamingContainer; // Get reference to the GridView control
        int rowIndex = ((GridViewRow)btn.NamingContainer).RowIndex; // Get the row index
        Label lblBeneName = (Label)gv.Rows[rowIndex].FindControl("RowNo"); // Find the control in the row
    }
    catch(Exception ex)
    {
        throw ex;
    }
}

Based on the code you have provided, it seems that you are trying to retrieve the value of a label control named "RowNo" in the selected GridView row when the user clicks on a LinkButton with the ID "lnkbtnVerify". However, you are encountering a null reference exception when trying to retrieve the GridView row index.

To fix this issue, you need to ensure that the LinkButton control is inside a GridView control and that the GridView has been populated with data. You can also check if the GridViewRow object returned by the NamingContainer property is not null before trying to access the controls inside it.

Here's an updated version of your code that includes these checks:

protected void lnkbtnVerify_Click(object sender, EventArgs e)
{
try
{
LinkButton btn = (LinkButton)sender;
GridViewRow grow = (GridViewRow)btn.NamingContainer;
    // Check if GridViewRow object is not null
    if (grow != null)
    {
        int rowIndex = grow.RowIndex;
        Label lblBeneName = (Label)grow.FindControl("RowNo");

        // Use rowIndex and lblBeneName as needed
    }
}
catch (Exception ex)
{
    // Handle the exception here
}

}