How to display multiple values in a combo box from a datatable

Question

I have a datatable having 3 fields out of which I need to combine the values of the 2nd and 3rd field and display in the combo box. My approach is as under

DataTable dt = new DataTable();
dt.Columns.Add("Id", typeof(int));
dt.Columns.Add("Col1", typeof(string));
dt.Columns.Add("Col2", typeof(string));            

Enumerable.Range(1, 10).ToList().ForEach(i => dt.Rows.Add(i, string.Concat("Col1", i), string.Concat("Col2", i)));

comboBox1.DataSource = dt;
comboBox1.DisplayMember = string.Format("{0} : {1}","Col1","Col2");

But I am getting the output as System.Data.DataRowView...

Even I cannot change it from stored procedure level. I can however do this using entity approach by exposing some property but that will be a huge change at present. Is there any mechanism by which i can use the datatable as source and accomplish the work.

Thanks

Solution 1

I have done it as under

DataTable dt = new DataTable();
            dt.Columns.Add("Id", typeof(int));
            dt.Columns.Add("Col1", typeof(string));
            dt.Columns.Add("Col2", typeof(string));
            dt.Columns.Add("ConcatenatedField", typeof(string), "Col1 + ' : ' +Col2"); 

            Enumerable.Range(1, 10).ToList().ForEach(i => dt.Rows.Add(i, string.Concat("Col1", i), string.Concat("Col2", i)));

            comboBox1.DataSource = dt;
            comboBox1.DisplayMember = "ConcatenatedField";

Solution 2

Try this..

  DataTable dt = new DataTable();
  foreach (DataRow dr in dt.Rows)
  {
      comboBox1.Items.Add(dr["Col1"].ToString() + dr["Col2"].ToString());
  }

Solution 3

        DataTable dt = ds.Tables[0];
        dt.Columns.Add("NewColumn", typeof(string));            

        foreach (DataRow dr in dt.Rows)
        {
            dr["NewColmun"] = dr["Column1"].ToString() + " " + dr["Co"].ToString();
        }
        Combo.DataSource = dt;
        Combo.DisplayMember = "NewColumn";
        Combo.ValueMember = "ValueField";

Comments

[Pundia]

I must add, the DataSource of the ComboBox SHOULD be set once you declared its DisplayMember and ValueMember. Otherwise, you can get data not displayed/obtained correctly (something as DataRow.etc).