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protected void btn_upload_Click(object sender, EventArgs e)
{
bool fileOK = false;
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{
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}
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{
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string fileExtesion = System.IO.Path.GetExtension(upload.FileName).ToLower();
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string[] allowExtesions = { ".doc", ".xls", ".rar", ".zip", ".ppt" };
for (int i = 0; i < allowExtesions.Length; i++)
 
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