Datatable objects not binded to combobox and textbox

Question

public void SendRoomIDtoCheckINNew(int RID)

{

try

{

object[,] ParamArray = new object[,] { { "@RoomID", RID } };

DataSet ds = new DataSet();

ds = DB.ExecuteQuery_SP("SelectRoomDetailsForGridByID", ParamArray);

if (ds.Tables.Count > 0)

{

cmbroomcat.DataSource = ds.Tables[0];

cmbroomcat.Text = ds.Tables[0].Rows[0]["RoomCategoryName"].ToString();

cmbroomno.DataSource = ds.Tables[0];

cmbroomno.DisplayMember = ds.Tables[0].Rows[0]["RoomNo"].ToString();

cmbroomno.Text = ds.Tables[0].Rows[0]["RoomNo"].ToString();

//cmbroomno.ValueMember = ds.Tables[0].Rows[0]["RoomID"].ToString();

txtCapacity.Text= ds.Tables[0].Rows[0]["RoomCapacity"].ToString();

}

}

catch (Exception ex) { ex.ToString(); }

}

 

 

above is my code but when i try to bind dt object to respective combo box and textbox it is not binding what is the reason behing it i am still confussing