context.Response.Write("<script type='text/javascript'>alert('File Uploaded successfully..!!');</script>");
var msg = string.Format(@"<script language='javascript'>alert('your text here');</script>"); context.Response.Write(msg);
string script = "<script type=\"text/javascript\">alert('alertmessagehere');</script>"; ClientScript.RegisterClientScriptBlock(this.GetType(), "Alert", script);
var
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