How to call c# method from js function [Resolved]

In my application I need to call c# method from js function call.

I tried...

<img id='img2' width="9px" border="0" src="plus.gif" onclick="MyHeader()"/> Header <div>
<asp:GridView ID="grdHeader" runat="server" AutoGenerateColumns="false">
<Columns>
</Columns>
</asp:GridView></div>

My JS Function:

function MyHeader() {
PageMethods.BindHeaderGrid();
}

My c# method:

[WebMethod]
public void FillHeaderGrid()
{
grdHeader.DataSource = ds.Tables[0];
grdHeader.DataBind();
}

But it is not working.

[Resolved]