c # valid data into two tables a table bonded

 

 

 <asp:DropDownList ID="ddlSpecialty" runat="server"  >
             
 </asp:DropDownList>

 

 　　　　　　　　　DataTable dt2 ; 
                DataTable dt1 ;

                 DataTable newDt = new DataTable();
                 newDt.Columns.Add("Name", typeof(string));
                 newDt.Columns.Add("Code", typeof(string));
                 
                foreach (DataRow dr in dt1.Rows)
                {
                    var dataRow = newDt.NewRow(); 
                    dataRow[0] = dr["ItemName"];
                    dataRow[1] = dr["ItemCode"]; 
                    newDt.Rows.Add(dataRow); 
                }
                foreach (DataRow dr in dt2.Rows)
                {
                   var dataRow = newDt.NewRow();
                    dataRow[0] = dr["ItemName"];
                    dataRow[1] = dr["ItemCode"]; 
                    newDt.Rows.Add(dataRow); 
                } 
                this.ddlSpecialty.DataTextField = "Name";
                this.ddlSpecialty.DataValueField = "Code";
                this.ddlSpecialty.DataSource = newDt;
                this.ddlSpecialty.DataBind();