How to Get the name on behalf of id..

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ASP.NET

Hello,

I have an Id in textbox and I want on behalf of id ,name should be displayed in an below another textbox.I have created an method but don't know where to call it..Please Help me...
Whenever I select the id,the below textbox should automatically be filled with an name of that particular Id..


This is my Id Text Box

<asp:TextBox ID="txtlinemanager" Width="120" CssClass="nonwatermarked" runat="server"></asp:TextBox>
              <asp:ImageButton ID="imgbtnbusinessheadid" runat="server" ToolTip="Click here for search..."
                           ImageUrl="~/Icons/search-button.gif" OnClientClick=' return OpenPopup("manager");

This is name name textbox

<div class="txtLTitleMenuEdit">
                Trustee Name</div>
            <div class="lblfullname">
                <asp:TextBox ID="txtTrusteeName" ReadOnly="true" Width="300" CssClass="nonwatermarked"
                    runat="server" ><div class="divnewline">
                    </div>

The Method i have created is

protected void TrusteeName()
   {
       using (SqlConnection con = new SqlConnection(connectionstring))
       {
           using (SqlCommand cmd = new SqlCommand("select trusteename from  table where Id='" + txtlinemanager.text + "'", con))
           {
               using (SqlDataAdapter adapt = new SqlDataAdapter(cmd))
               {
                   DataSet ds=new DataSet();
                   adapt.Fill(ds);
                   txttrusteename.text = ds.Tables[0].Rows[0]["trusteename"].ToString();
               }

           }
       }
   }