Export to excel entireColumn Autofit not working in Javascript

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Javascript

C#5.0

Hi All,

I am using export to excel functionality in Shrepoint using JavaScript. But Auto Fit is not working for the same.
Is anyone is having anyidea.
Below is the code snippet.

function ExportHTMLTableToExcel() { 
    //var thisTable = document.getElementById("ExcelData").innerHTML; 
    var thisTable = $("div.ExcelData").html(); 
    window.clipboardData.setData("Text", thisTable); 
    var objExcel = new ActiveXObject("Excel.Application"); 
    objExcel.visible = true; 
    var objWorkbook = objExcel.Workbooks.Add; 
    var objWorksheet = objWorkbook.Worksheets(1); 
    objWorksheet.Paste; 
    ExcelSheet.Range("A1", "B1", "C1").EntireColumn.AutoFit(); 
    objWorksheet.Range("A1", "Z1").EntireColumn.AutoFit(); 
    
    objWorksheet.Range("C1", "C1").ColumnWidth = 2000; 
}

Thanks in Advance