using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack)
{
WebControl wcICausedPostBack = (WebControl)GetControlThatCausedPostBack(sender as Page);
int indx = wcICausedPostBack.TabIndex;
var ctrl = from control in wcICausedPostBack.Parent.Controls.OfType<WebControl>()
where control.TabIndex > indx
select control;
ctrl.DefaultIfEmpty(wcICausedPostBack).First().Focus();
}
}
protected Control GetControlThatCausedPostBack(Page page)
{
Control control = null;
string ctrlname = page.Request.Params.Get("__EVENTTARGET");
if (ctrlname != null && ctrlname != string.Empty)
{
control = page.FindControl(ctrlname);
}
else
{
foreach (string ctl in page.Request.Form)
{
Control c = page.FindControl(ctl);
if (c is System.Web.UI.WebControls.Button || c is System.Web.UI.WebControls.ImageButton)
{
control = c;
break;
}
}
}
return control;
}
protected void TextBox1_TextChanged(object sender, EventArgs e)
{
Response.Write("1 text box");
}
protected void TextBox2_TextChanged(object sender, EventArgs e)
{
Response.Write("2 text box");
}
protected void TextBox3_TextChanged(object sender, EventArgs e)
{
Response.Write("3 text box");
}
}
in source
-------------
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True"
ontextchanged="TextBox1_TextChanged" TabIndex="1"></asp:TextBox>
<asp:TextBox ID="TextBox2" runat="server" AutoPostBack="True"
ontextchanged="TextBox2_TextChanged" TabIndex="2"></asp:TextBox>
<asp:TextBox ID="TextBox3" runat="server" AutoPostBack="True"
ontextchanged="TextBox3_TextChanged" TabIndex="4"></asp:TextBox>
<asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
<br />
<asp:Button ID="Button1" runat="server" Text="Button" />
</div>
</form>
</body>
</html>
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