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AJAX Resizable Extender Control
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ASP.NET AJAX offers you Resizable Extender Control. ResizableControl is an extender that attaches to any element on a web page and allows the user to resize that control with a handle that attaches to lower-right corner of the control. The resize handle lets the user resize the element as if it were a window.
<ajaxToolkit:ResizableControlExtender ID="ResizableControlExtender1" runat="server" TargetControlID="Panel1" />
There are the following properties of Resizable extender control:
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TargetControlID
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HandleCssClass
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ResizableCssClass
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MinimumWidth
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MinimumHeight
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MaximumWidth
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MaximumHeight
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OnClientResizeBegin
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OnClientResizing
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OnClientResize
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HandleOffsetX
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HandleOffsetY
Example:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ResizableControl.aspx.cs" Inherits="ResizableControl" %> <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %> <!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 id="Head1" runat="server"> <title>Resizable Control</title> <style type="text/css"> .handle { width:10px; height:10px; background-color:#aaccee; } .resizing { padding:0px; border-style:solid; border-width:1px; border-color:#aaccee; cursor:se-resize; } </style> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager runat="server" ID="scriptManager" /> <div> <asp:Panel ID="Panel1" runat="server" Style="width: 300px; height: 200px;"> <asp:Label ID="image1" runat="server" Text="ASP.NET AJAX offers you Resizable Extender Control. ResizableControl is an extender that attaches to any element on a web page and allows the user to resize that control with a handle that attaches to lower-right corner of the control. The resize handle lets the user resize the element as if it were a window."> </asp:Label> </asp:Panel> <ajaxToolkit:ResizableControlExtender ID="ResizableControlExtender1" runat="server" TargetControlID="Panel1" HandleCssClass="handle" ResizableCssClass="resizing" MaximumHeight="400" MaximumWidth="500" MinimumHeight="100" MinimumWidth="100" HandleOffsetX="5" HandleOffsetY="5" /> </div> </form> </body> </html>
Output: Now Press F5 to debug the application. You will get the following output:

If you want to resize the panel then put the mouse on right button corner and drag as you want.
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Purushottam Rathore
I am working as a Software Developer and has 4 years of experience on Microsoft Technology and having a Master Degree in Computer Application. I really like to work in the .NET platform. and working with ASP.NET 2.0/3.5, Web Services, WPF, WCF, Silverlight, AJAX, JavaScript, JQuery, Ado.net, MsAccess, SQL Server 2005/2008.
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