Why DataTable Object Gets another Datatable object Data?

See more:

C#

C#4.0

ASP.NET4

I am getting "DataTable Object Gets another Datatable object Data exception"..
Why it Causes?

public void getemployee()
{
    objfeedretailPL.status = 6;
    DataTable dtemployee = new DataTable();

    dtemployee = objfeedretailBAL.GetType(objfeedretailPL);
    if (dtemployee.Rows.Count > 0)
    {
        ddlreferredby.DataSource = dtemployee;
        ddlreferredby.DataTextField = "employeename";
        ddlreferredby.DataValueField = "employeename";
        ddlreferredby.DataBind();
        ddlreferredby.Items.Add(new ListItem("--Select--", "0"));
        ddlreferredby.SelectedIndex = ddlreferredby.Items.Count - 1;
    }
}

Here dtemployee get another page DataTable Information
What Should I do...Please Suggest Me...