Error while exporting to Excel with Gridview

Hello all,

I'm getting some errors while exporting the data in my gridview to excel. I have a column called account number which is not showing properly in Excel.

For example, the account number 9001022199001 is showing up as 9.00103E+12. But when I click on the field in Excel, it shows up correctly. I think its a formatting error in Excel but I'm not sure if the problem is Excel or my code.  

How can I fix this problem?

protected void Button1_Click(object sender, EventArgs e)
    {
        GridView gTempViewForExcelExport = new GridView();
        PopulateGrid();
        gTempViewForExcelExport.DataSource = m_dsContractorData;
        gTempViewForExcelExport.AllowPaging = false;
        gTempViewForExcelExport.DataBind();
 
        GridViewExportToExcel.Export("BulkExtract.xls", gTempViewForExcelExport);
      
    }
    protected void gvUsers_RowDataBound(object sender, GridViewRowEventArgs e)
    {
 
        if (((GridViewRowEventArgs)e).Row.RowType == DataControlRowType.DataRow)
        {
            ((GridViewRowEventArgs)e).Row.Cells[1].Attributes.Add("class", "text");
        }
    }

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