How to assign Event Handler to a HTML button or ASP button created in Code Behind with TreeView

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C#

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Hi I am trying this since last four days but not getting it to work. I have a tree view control in my page with which I am creating html button with each tree node in code behind.

Like this:

foreach (DataRow row in ds.Tables[0].Rows)
            {

                {
                    TreeNode childTreeNode = new TreeNode();
                    string date_created = row["date"].ToString();

                    string date = DateTime.Parse(date, CultureInfo.InvariantCulture).ToString("MM/dd/yyyy");
                    StringBuilder text = new StringBuilder();

                    text.Append(row["col_name"].ToString() + "  " + row["col_name"].ToString() + "." + row["col_name"].ToString() + "." + row["col_name"].ToString() + " <span style='color: black;fontstyle:italic;'>" + " (Created Date-" + date + ") " + "</span>");

                    text.Append(@"<button onclick=""javascript:clickedMe""><img src=""/Images/getInfo.png"" width=""30"" height=""15"" ></button>");

                    childTreeNode.Text = text.ToString();

So this part is working just fine. Right now what I am doing is that in my aspx page I have a javascript method as follows:

<script type ="text/javascript" language="javascript">
function clickedMe() {

    <%
      if(IsPostBack)
       {
       getResult();
       }
   %>
}
      <;/script>

and in my code behind I have this getResult() method as follows:

public void btnGetData()
{
    try
    {
        {

            Session["name"] = TreeView1.SelectedNode.Text;
            if (IsPostBack)
            {
                Session["name"] = TreeView1.SelectedNode.Text;
                TreeView1.SelectedNode.Selected = false;
                ScriptManager.RegisterStartupScript(this, typeof(string), "OPEN_WINDOW", "var Mleft = (screen.width/2)-(760/2);var Mtop = (screen.height/2)-(700/2);window.open( 'GetResult.aspx', null, 'height=400,width=800,status=yes,toolbar=no,minimizable=yes,maximizable=no, resizable= yes,scrollbars=yes,menubar=no,location=no,top=\'+Mtop+\', left=\'+Mleft+\'' );", true);

            }

        }
    }
    catch (Exception ex)
    {
        Exception E = ex;
    }
}

I also have treeview node change event.

public void Select_Change(Object sender, EventArgs e)

So Clicking on button and node should open different windows.

The problem: When I click to button and after clicking on button if I click on the node associated with the same button I clicked, it opens the same window(i.e. opened by button), it should open different window. But if I click on another node it works fine and after clicking on another node if I click on that node again it will work fine.

I am really confused with this. I have tried almost all ways to solve this problem from the internet.

Is there is a way that I can attach my button to Click event Handler. I have tried it but it always gives me error while running that method is undefined.

Please help me.