protected void Page_Load(object sender, EventArgs e)
        {
            String csname1 = "PopupScript";
            String csname2 = "ButtonClickScript";
            Type cstype = this.GetType();
            int a = 3;
            int b = 5;

            // Get a ClientScriptManager reference from the Page class.
            ClientScriptManager cs = Page.ClientScript;

            // Check to see if the startup script is already registered.
            if (!cs.IsStartupScriptRegistered(cstype, csname1))
            {
                String cstext1 = "alert('Hello World');";
                cs.RegisterStartupScript(cstype, csname1, cstext1, true);
            }

            // Check to see if the client script is already registered.
            if (!cs.IsClientScriptBlockRegistered(cstype, csname2))
            {
                StringBuilder cstext2 = new StringBuilder();
                cstext2.Append("<script type=\"text/javascript\"> function CreateTable(a,b) {");
                //cstext2.Append("alert('12545')} </");
                cstext2.Append("script>");
                cs.RegisterClientScriptBlock(cstype, csname2, cstext2.ToString(), false);
            }            
        }

<script type="text/javascript" language="javascript">

function CreateTable(a, b)
{
    var table = document.createElement('table');
    var row = table.insertRow(-1);
    var cell = row.insertCell(-1);
	cell.innerHTML = a;
	var row = table.insertRow(-1);
	var cell = row.insertCell(-1);
	cell.innerHTML = b;
	document.body.appendChild(table);    
}
    
</script>

cstext2.Append("<script type=\"text/javascript\"> function CreateTable(a,b) {");

<input runat="server" type="text" id="Message" /> <input type="button" value="ClickMe" onclick="CreateTable()" />