Answer / guest

<asp:FileUpload ID="FileUpload1" runat="server"
onchange="change(this);" />


//js
function change(fileupload) {

if (fileupload.value.indexOf('jpg') == '-1') {
document.getElementById('TextBox1').value =
'Nopicture';
alert('Select *.jpg file only');
}
if (fileupload.value.indexOf('jpg') != '-1') {
document.getElementById('TextBox1').value =
'haspicture';
}

}

function changevalue() {
if
(document.getElementById('FileUpload1').value == '') {
alert('Please select a file');
return false;
}
if
(document.getElementById('FileUpload1').value !='')
{
if
(document.getElementById('FileUpload1').value.indexOf('jpg')
== '-1') {

alert('upload *.jpg images only');
return false;
}
}


//code behind
protected void btnUpload_Click(object sender, EventArgs e)
{
if (btnUpload.Text == "Upload")
{
if (FileUpload1.HasFile)
{

Stream imgStream =
FileUpload1.PostedFile.InputStream;

int imgLen =
FileUpload1.PostedFile.ContentLength;
byte[] img = new byte[imgLen];
int n = imgStream.Read(img, 0, imgLen);
Session["Picture"] = img;
lblMessage.Text = "Attached";
btnUpload.Text = "Remove";
}
else
{
Session["Picture"] = null;
}

}
else
{
Session["Picture"] = null;
btnUpload.Text = "Upload";
lblMessage.Text = "Removed";
}
}

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