ASP.NET

protected void Button3_Click(object sender, EventArgs e)
    {
        string filepath = "D:\\csvData.csv";
        FileInfo file = new FileInfo(filepath);

        if (file.Exists)
        {
            Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name);
            Response.AddHeader("Content-Length", file.Length.ToString());
            Response.ContentType = "application/vnd.ms-excel";
            Response.WriteFile(file.FullName);
            //Response.TransmitFile(file.FullName);
            Response.End();
        }
    }

Function Unit()
{
---- some code
-----
-------
---
----
.
.
.
}

Function Unit()
{
---- some code
-----
Fun1(arg1,arg2)
---
Fun2(arg1,arg2)

.
.
.
}

public static short ConvertToShort(object oData)
        {
            if (oData.ToString() == "")
            {
                return 0;
            }
            else
            {
                return Convert.ToInt16(oData);
            }
        }