Canvas drawing problem on click

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ASP.NET

jQuery

Hi, I'm having problems drawing on my canvas.

When the user clicks on the canvas, I'm getting the coordinates through jQuery and passing them in the code behind.

The method that is receiving the parameters has to be static therefore I'm developing the drawing code into another method which has a return type of StringBuilder. So from the static method that is receiving the coordinates, I'm instantiating the class I;m working in and calling that method but still nothing is drawn on the canvas. I tried it using a button and worked perfectly.
Thanks!

<br />
<pre lang="cs">public void add(int xPosition, int yPosition)<br />
       {<br />
           StringBuilder sb = new StringBuilder();</pre><br />
//code..<br />
<br />
ClientScript.RegisterStartupScript(this.GetType(), "TestScript", sb.ToString());<br />
}<br />

<pre lang="cs">[WebMethod]<br />
        public static void mousedown(int xc, int yc)<br />
        {<br />
            Create cm = cm.Button1_Click(null, null);<br />
            return new Create().add(xc, yc);<br />
<br />
        }</pre><br />