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You can add the &quot;onBlur&quot; attribute to the dropdownlist which can call some javascript which if need be can in turn call a web service or use ajax to communicate back to the server.<br />
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&lt;asp:DropDownList ID=&quot;DropDownList1&quot; runat=&quot;server&quot; onBlur=&quot;javascript: alert('lost focus');&quot;&gt;&lt;/asp:DropDownLi<wbr />st&gt;
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You can add the "onBlur" attribute to the dropdownlist which can call some javascript which if need be can in turn call a web service or use ajax to communicate back to the server.

<asp:DropDownList ID="DropDownList1" runat="server" onBlur="javascript: alert('lost focus');"></asp:DropDownList>

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I tried it. but the error message i got is<br />
Attribute 'onBlur' is not a valid attribute of element dropdownlist.<br />
<br />
Is there any other solution for it?
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I tried it. but the error message i got is
Attribute 'onBlur' is not a valid attribute of element dropdownlist.

Is there any other solution for it?

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Like the lost focus event for a dropdownlist in VB6, is there any similar event which i can use in C# web application.
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Like the lost focus event for a dropdownlist in VB6, is there any similar event which i can use in C# web application.

Lostfocus in C# dropdownlist

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.

.NET Programming

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).