How to get the row Index in Onclick event

protected void Abeyance_Click(Object sender, System.EventArgs e)
{
    int memoid = Convert.ToInt32(Session["MemoID"]);
    string description = TextBox3.Text;
    string priority = TextBox4.Text;
    DateTime dt2 = DateTime.ParseExact(TextBox5.Text, "d/M/yyyy", null);
    objMemoBAL.InsertToAbeyance("MemoAbeyance", memoid, description, priority, dt2, "Internal Memo",Session["Empcode"].ToString());
        
    HiddenField hdnMemoId = new HiddenField();
    LinkButton lnk = sender as LinkButton;
    
    GridViewRow gvrCurrent = ((LinkButton)lnk).NamingContainer as GridViewRow;
    hdnMemoId = (HiddenField)gvrCurrent.FindControl("hdnMemoId");
    int id = Convert.ToInt32(gvList.DataKeyNames[gvrCurrent.RowIndex]);
            
    gvList.DeleteRow(id);
            
    Response.Redirect("frmInternalMemo.aspx");
}// Abeyance and Defer