Excel datas are not displaying properly

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C#3.5

MS-Excel

Hi,

In my form I am using an option to attach a document. In this, the user is able to attach all kinds of documents. The user has the option to view the attached document, while clicking the view button they can view the document. For all types of document it works fine except for the excel. The original data is not displaying, it's displaying some unknown datas. Can anyone help me to solve this issue. Here is the code:

protected void GridView1_SelectedIndexChanging(object sender, GridViewSelectEventArgs e)
{
try
{
    string fileName = ((Label)GridView1.Rows[e.NewSelectedIndex].FindControl("lnkFileName")).Text;
    Session["fileopen"] = fileName;
    string path = GetPath() + fileName;
    FileInfo file = new FileInfo(path);
    if (file.Exists)
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["MySqlDatabase"].ConnectionString);
        con.Open();
        cmd = new SqlCommand("select * from FileTypes with(nolock) where extension='" + file.Extension + "'", con);
        cmd.CommandTimeout = 0;
        myReader = cmd.ExecuteReader();
        cmd.CommandTimeout = 0;
        if (myReader.Read())
        {
            myReader.Close();
            SessionVarriables.ViewFileSession = path;
            SessionVarriables.ViewFileNameSession = "File";
            Response.Redirect("ViewDocument.aspx");
        }
        else
        {
            myReader.Close();
            Message1("Cannot open selected file");
            return;
        }
        con.Close();
    }
    else
    {
        Message1("File not found");
    }
}
catch (Exception ex)
{
    UserUtil.Message(ex.Message, this);

}

}

Thanks in advance.