string ctypes = Convert.ToString(dtPtsDetail.Rows[0]["Type1"]);

            string\[\] arr = ctypes.Split(',');  
            for (int c = 0; c < arr.Length - 1; c++)  
            {  
                    ddlType.Items.Add(arr\[c\]);

            }

            foreach (string ar in arr)  
            {  
                foreach (ListItem itc in ddlType.Items)  
                {  
                    if (ar == itc.Value)  
                        itc.Selected = true;  
                    else  
                        continue;  
                }

            }

string ctypes = Convert.ToString(dtPtsDetail.Rows[0]["Type1"]);

            string\[\] arr = ctypes.Split(',');

                     ddlType.SelectedIndex = ddlType.Items.IndexOf(ddlType.Items.FindByValue(arr\[0\]));