How to define the Type parameter in ClientScript.RegisterClientScriptBlock? Thank

[mycwcgr]

How to define the Type parameter in ClientScript.RegisterClientScriptBlock? Thanks!

When I run the code Part 1, I get a alert information:
'System.Web.UI.Page.RegisterClientScriptBlock(string, string)' is obsolete: 'Use ClientScript.RegisterClientScriptBlock(string key, string script) instead. http://go.microsoft.com/fwlink/?linkid=14202'

So I have to replace the code with Part 2, but whenI run the code Part 2, I get a error information

Value cannot be null.
Parameter name: type


The I first parameter is Type value in ClientScript.RegisterClientScriptBlock function.
but I don't know how to pass a value to the first parameter, could you help me?


//--------------------Part 1-------------------------------
public void ShowMessage(string input) {
string strScript;
strScript =@"<script language=javascript> ";
strScript = strScript + "alert('"+input+"')";
strScript = strScript + @"</script>";
RegisterClientScriptBlock("clientScript", strScript);
}

protected void Button1_Click(object sender, EventArgs e)
{
ShowMessage("cw");
}

//--------------------Part 1-------------------------------


//--------------------Part 2-------------------------------
public void ShowMessage(string input) {
string strScript;
strScript =@"<script language=javascript> ";
strScript = strScript + "alert('"+input+"')";
strScript = strScript + @"</script>";
ClientScript.RegisterClientScriptBlock(null,"clientScript", strScript);
}
//--------------------Part 2-------------------------------

[TopGoat]

simply use..
typeof (Page)