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C# code:

<script runat="server">
protected void sureBtn_Click(object sender, EventArgs e)
{
if (titleTxt.Value == "" || text.Text == "" || nameText.Value == "")
{
//µ¯³ö¶Ô»°¿ò
}
else
{
//Ö´ÐÐÓï¾ä
}
</script>



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response.write(" <script>alert('your message') </script>")

Page.RegisterStartupScript(""," <script>alert('xxxxxxxxxxx'); </script>");

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C# code:
Response.Write("<script language=javascript>alert('ÌáʾÐÅÏ¢');</script>");
return;



Such As
this.ClientScript.RegisterStartupScript(this.GetType(),""," <script lanaguage='javascript'>alert('Óû§Ãû»òÃÜÂë²»´æÔÚ??·Ç¹ÜÀíÔ±?!');location.href='Default.aspx' </script>");

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