Checking File Extension
string ext = System.IO.Path.GetExtension(FileUpload1.FileName);
if (ext != ".jpg" && ext != ".jpeg")
{
Response.Write("accept only jpg file");
}
else
{
FileUpload1.SaveAs(Server.MapPath("~") + "//upload//" + FileUpload1.FileName);
Image1.ImageUrl = "~/upload/" + FileUpload1.FileName;
}
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