how to add select option in combobox

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i want to add a --Select-- option in combobox in c#.net windows application. i am using visual studio 2008. in this combobox have already datasouce how can i add the select option in this combobox.
i tried
combobox1.Items.Insert(0,"select") and combobox1.Items.add(0 new ListItem("0","select"));
but it's not working. please help.

thanks in advance

Posted 5-May-14 22:11pm

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DamithSL 6-May-14 4:40am

how you data bind? please update the question with your code

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Manu Smriti · Answer 1 · 2014-05-05T22:52:00

This will insert new item in combobox
CombBox1.Items.Insert(0, "New Item");
Remember one thing you can not add item once datasource is set. So, you add item in datasource itself. like:
DataTable dtCombo = new DataTable();
DataRow drow;
dtCombo.Columns.Add("Id",typeof(int));
dtCombo.Columns.Add("Name",typeof(string));
drow = dtCombo.NewRow();
drow[0]=1;
drow[1]="One";
dtCombo.Rows.Add(drow);
DataRow drow2 = dtCombo.NewRow();
drow2[0] = 2;
drow2[1] = "Select";

dtCombo.Rows.InsertAt(drow2, 0);
dtCombo.AcceptChanges();

cmbTest.DisplayMember = "Name";
cmbTest.ValueMember = "Id";
cmbTest.DataSource = dtCombo.DefaultView;