[RESOLVED] extedning user controls

I am very new to this c#. I was wondering if someone can help me in this problem... Say for example i have written the following control see code below..Now i want to add a paging (just an example) as another control, which however extend this control. How can i do that. I am trying to do it but it is giving me error. Can anyone correct me please.

public partial class ThmbListing : System.Web.UI.UserControl
{

#region Fields ------------------------------------------------------------------------

public DataSet ds ;
public Icon icon;
private int pagesize = 5;

#endregion

#region Public properties


public int GridPageSize
{
get
{
return this.pagesize;
}
set
{
this.pagesize = value;
this.GridView1.PageSize = value;

}
}


#endregion

#region Public Protected Methods

public string setImagesNullValue(string imageValue)
{
string ImagesValues = "";

if (imageValue != "")
{
ImagesValues = imageValue + "width=150&height=150";
}
else
{
ImagesValues = System.Configuration.ConfigurationManager.AppSettings["URL"] + "/images/imageNotAvailable.gif";
}
return ImagesValues;

}

protected void MyDataBind()
{
try
{
this.ds = new DataSet();
this.icon = new Icon();
SqlConnection cn = new SqlConnection();
cn.ConnectionString = System.Configuration.ConfigurationManager.AppSettings["DBConnectionString"];
SqlDataAdapter da = new SqlDataAdapter("select * from ResidentialListingView", cn);
da.Fill(this.ds);
this.GridView1.DataSource = this.ds;
this.GridView1.DataBind();
cn.Close();
this.ds.Dispose();
}
catch { }



}

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
//GridPageSize = 5;
MyDataBind();

}

}

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
ViewState["CurrentPage"] = e.NewPageIndex;
GridView1.PageIndex = e.NewPageIndex;
MyDataBind();
}

protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Pager)
{

int count = GridView1.PageCount * GridView1.PageSize;
int Totalpropery = this.ds.Tables[0].Rows.Count;
int startRecrod = 0;
int endRecrod = 0;

startRecrod = (GridView1.PageIndex * GridView1.PageSize) + 1;
if (GridView1.PageIndex + 1 == this.GridView1.PageCount)
endRecrod = Totalpropery;
else
endRecrod = (GridView1.PageIndex + 1) * GridView1.PageSize;
lblView.Text = "Viewing : <B>" + startRecrod + "</B> - <B>" + endRecrod + "</B> of <B>" + Totalpropery + "</B>";


}

}

#endregion



}

/////Beolw is i am tryng to extend

public partial class PageOrder :ThmbListing
{

protected void SizeList_SelectedIndexChanged(object sender, EventArgs e)
{
GridPageSize = Convert.ToInt32(SizeList.SelectedItem.Value);
MyDataBind();
}
}

What's the error description? I understand that while trying to compile with a partial class you need to have the other partial class in place as well (though I myself has never worked on it) but found this piece of info here.

Please don't post that you're getting an error and not give the error message or the location of the error. Also, please don't post code without [code] tags.