How can i Catch Data Field values

my grid view

i just want to show this data in a modal popup  

i trying to bind data field vales in a popup 

popup is displaying but data fileds are not displaying help me pls

this is my pop up but values are not binding

protected void ddlshowtop_SelectedIndexChanged(object sender, EventArgs e)
{
    lblBenName.Text = (grdvwMerchantBanks.SelectedRow.FindControl("BeneficiaryName") as TextBox).Text;
    lblbnkName.Text = (grdvwMerchantBanks.SelectedRow.FindControl("BankName") as Label).Text;
    lblBacNum.Text = (grdvwMerchantBanks.SelectedRow.FindControl("AccountNumber") as Label).Text;
    lblIfsc.Text = (grdvwMerchantBanks.SelectedRow.FindControl("IFSC") as Label).Text;
    lblNaPp.Text = (grdvwMerchantBanks.SelectedRow.FindControl("NameAsPerBank") as Label).Text;
    Mpe.Show();
}
protected void lnkDetails_Click(object sender, EventArgs e)
{
}
protected void grdvwMerchantBanks_RowCommand(object sender, GridViewCommandEventArgs e)
{
    if (e.CommandName.Equals("Select"))
    {
        Mpe.Show();
        int index = Convert.ToInt32(e.CommandArgument);
        GridViewRow row = grdvwMerchantBanks.Rows[index];
        ImageButton ImageButton1 = (ImageButton)row.FindControl("imagepop");
    }
}