HTML Table Export To Excel _ In SharePoint Using Custom WebPart

I had some requirement that I want to export my html table to Excel sheet. So, I used to below some line of code for that.

public void ExportExcel()
        {
            Response.AppendHeader("content-disposition", "attachment;filename=ExportedHtml.xls");
            Response.Charset = "";
            Response.Cache.SetCacheability(HttpCacheability.NoCache);
            Response.ContentType = "application/vnd.ms-excel";
            this.EnableViewState = false;
            Response.Write(ExportDiv);
            Response.End();

        }

But, Here I got some problem. After downloading the excel sheet by browser, the Page was unresponsive i.e. no postback was there after the file downloaded. That was very strange for me, because the same code was working with the normal asp.net page and not with the SharePoint Page.
But thanks to Google and StackOverflow, that I got some link with the excect issue and solution.

Actually, when we download the excel file using the http, at that time for SharePoint Page , there is one property named _spFormOnSubmitCalled becomes true , which is by default false.
We will set it to the false again and the postback will work for us.

The detailed information you will get from the below link :
http://stackoverflow.com/questions/2336883/post-back-does-not-work-after-writing-files-to-response-in-asp-net

Here, when we download the Excel file, we got the warning for the formate of the excel sheet , we need to use another way to solve it.

We need to use below code for that : 

http://www.aspsnippets.com/Articles/Solution-ASPNet-GridView-Export-to-Excel-The-file-you-are-trying-to-open-is-in-a-different-format-than-specified-by-the-file-extension.aspx

Hope, this blog will help you.

Thanks.