File Upload Control inside Update Panel....

Purpose: How to use FileUploadControl Inside Update Pannel ASp.Net

.aspx page
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.cs file
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protected void SubmitButton_Click(object sender, EventArgs e)
{
Label SubmitButtonLabel2 = (Label)UpdatePanel1.FindControl("SubmitButtonLabel");
if (FileUpload1.HasFile)
{
string[] fileName = FileUpload1.FileName.Split('.');
string _extension = fileName[fileName.Length - 1];
if (_extension == "jpg" || _extension == "gif" || _extension == "bmp" || _extension == "png")
{
string _filepath = Server.MapPath("~/UPLOADIMAGE");
FileUpload1.PostedFile.SaveAs(_filepath + "\\" + FileUpload1.FileName);
SubmitButtonLabel2.Text = "File Accepted.";
}
else
{
SubmitButtonLabel2.Text = "File type not allowed. Please choose another.";
}
}
else
{
SubmitButtonLabel.Text = "Please select a file.";
}

}