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I meet about problem to pass arguments to the client-side event OnClientClicking .

I tried to use the String.Format () function, but it does not work.

Do you have an idea for a workaround to send parameter linked with OnClientClicking ?

Code asp :

<telerik:RadButton ID="bnt_meetingDelete" runat="server" OnClientClicking="<%# string.Format("confirmCallBackFn('{0}');",Eval("MeetingID")) %>" Image-ImageUrl="~/image/icone/delete-icon.png" Image-IsBackgroundImage="true" Width="21" Height="21" telerik:RadButton>
Error IIS:
Parser Error 
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. 
Parser Error Message: The server tag is not well formed.
I tried with controller [asp: ImageButton ]. And is the same mistake  
Change  double quote to single quote from
OnClientClicking="<%#string.Format("confirmCallBackFn('{0}');",Eval("MeetingID")) %>"
OnClientClicking='<%#string.Format("confirmCallBackFn('{0}');",Eval("MeetingID")) %>'
Or remove your string.Format and use like this
OnClientClicking='<%# "confirmCallBackFn("+ Eval("MeetingID") + ");" %>'
                I had to escape the quotes inside the string.format string with slashes and use double quotes confirmCallBackFn(\"{0}\") and to get double quotes inside that javascript string I had to triple escape them like so "return confirm(\"Delete \\\"{0}\\\"?\")"
– Matthew Lock
                Jun 7, 2018 at 6:50
OnClientClick='<%# "text1" + Eval("value") + "text2"  %>'
Make you you escape the \" correctly for it to work correctly:
OnClientClick='<%# "return confirm(\"Are you sure you want to unlock this user " + Eval("Lockout") + "?\");" %>'/>
It will be look like this after it rendered:
onclick="return confirm("Are you sure you want to unlock this user True?");"
        
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