Data is not loading on fist click of button it is coming in 2nd click of custom webpart

Hi,

I suggest to override the RenderWebPart method instead of Render method.

From this document(MSDN) "Although the Render method of the WebPart base class is defined to be overridden, it is not recommended that you do so. Instead, to implement the rendering for a Web Part, override the RenderWebPart method".

Here is a code sample about using WebPart class:

http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.webpartpages.webpart.aspx

Feel free to reply if you have any questions in SharePoint.

best regards

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Patrick Liang

TechNet Community Support