Calling a serverside method by __doPostBack()?

Tridip Bhattacharjee

Suppose i have a server side method called Update() and i have one dropdown. when user select any element from dropdown then how could i call the server side method Update() by __doPostBack(). is it possible to call directly the method Update() by __doPostBack() if so then please help me with a sample code. Thanks in advance.

tbhattacharjee

Viral Upadhyay

Tridip Bhattacharjee wrote:

is it possible to call directly the method Update() by __doPostBack()

Directly No. but you can call any button event in __doPostBack(). So make hidden button any call it by __doPostBack() and in this event call your Update() method. Viral

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amitabha123

Check This Example: .aspx <%@ Page Language="C#" AutoEventWireup="true" CodeFile="test-file-upload1.aspx.cs" Inherits="test_file_upload1" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> <script language="javascript" > function PostBack(t) { __doPostBack('Test',t.value); } </script> </head> <body> <form id="form1" runat="server"> <div> <asp:DropDownList ID="DropDownList1" AutoPostBack="true" runat="server"> <asp:ListItem Value="1">1</asp:ListItem> <asp:ListItem Value="2">2</asp:ListItem> <asp:ListItem Value="3">3</asp:ListItem> <asp:ListItem Value="4">4</asp:ListItem> </asp:DropDownList> </div> </form> </body> </html> .cs using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.IO; public partial class test_file_upload1 : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { DropDownList1.Attributes.Add("onchange", "PostBack(this);"); if (IsPostBack) { string strControlName = ""; strControlName = Request.Params.Get("__EVENTTARGET"); if (strControlName == "Test") { string strArgument = ""; strArgument = Request.Params.Get("__EVENTARGUMENT"); Update(strArgument); } } } private void Update(string strTest) { Response.Write("You have selectecd: " + strTest); } }