I am trying to update row in GridView from database using Row Command Event, but it is not updating.

Below is GridView.

<asp:TemplateField>
    <ItemTemplate>
        <asp:Button ID="Btn_Close" runat="server" Text="close" CommandName="close" CommandArgument='<%# Container.DataItemIndex %>'/> 
    </ItemTemplate>
 </asp:TemplateField>

C#

protected void GVDetail_RowCommand(object sender, GridViewCommandEventArgs e)
{
    if (e.CommandName == "close")
    {
        // int id = Convert.ToInt32(GVDetail.DataKeys[e.RowIndex].Value);
        //Determine the RowIndex of the Row whose Button was clicked.
        int rowIndex = Convert.ToInt32(e.CommandArgument);
        //Reference the GridView Row.
        GridViewRow row = GVDetail.Rows[rowIndex];
        string query = "[SP_Ret_Wiper_List]";
        using (SqlCommand cmd = new SqlCommand(query))
        {
            cmd.Connection = con;
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@Action", "OrderDel");
            cmd.Parameters.AddWithValue("@Order_ID", rowIndex);
            cmd.Parameters.AddWithValue("@Del_ID", 1);
            cmd.Parameters.AddWithValue("@Del_date", DateTime.Now.ToString());

            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();

            Loadgrn();
        }
    }
}