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You would use the same method as any other input, you just need to be sure to reference it's client ID (which is different that the ID tag you give it in the ASPX page): <br />
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$(&quot;#'&lt;%=DropDownListID.Cli<wbr />entID %&gt;'&quot;)<br />
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Replace DropDownListID with the ID tag you assigned in your .NET code.
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You would use the same method as any other input, you just need to be sure to reference it's client ID (which is different that the ID tag you give it in the ASPX page):

$("#'<%=DropDownListID.ClientID %>'")

Replace DropDownListID with the ID tag you assigned in your .NET code.

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If I add the ID of the radiobuttonlist it puts the error message text in the first list option. I want the error text to appear next or below the radiobuttonlist. 
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If I add the ID of the radiobuttonlist it puts the error message text in the first list option. I want the error text to appear next or below the radiobuttonlist.

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You can use the asp:RequiredFieldValidator<wbr /> instead for that field. &nbsp;When a radio button list is rendered on the client side, it shows up as separate input controls with the same name. &nbsp;So the method you are using ties itself to the first item, not all the items as a single unit.
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You can use the asp:RequiredFieldValidator instead for that field.  When a radio button list is rendered on the client side, it shows up as separate input controls with the same name.  So the method you are using ties itself to the first item, not all the items as a single unit.

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I have been working with the plugin from this site <br />
<a href="http://bassistance.de/jquery-plugins/jquery-plugin-validation/" rel="ugc">http://bassistance.de/jquery-plugins/jquery-plugin-validation/</a><br />
<br />
What I can't figure out is how to apply the validation to a asp.net radio button list. Can someone help me.
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I have been working with the plugin from this site 
http://bassistance.de/jquery-plugins/jquery-plugin-validation/

What I can't figure out is how to apply the validation to a asp.net radio button list. Can someone help me.

jquery and .net radiobuttonlist

jQuery (Core) is a cross-browser JavaScript library that provides abstractions for common client-side tasks such as Document Object Model (DOM) traversal, DOM manipulation, event handling, animation and Ajax. jQuery also provides a platform to create plugins that extend jQuery's capabilities beyond those already provided by the library.