How can I spare Combobox item's 0?

I want to show a text which inform users for a selection but the condition below spoils that. How can I handle this fact?

comboBox1.Items.Insert(0, "Please select any value");
comboBox1.SelectedIndex = 0;
comboBox1.DisplayMember = "TotalName";
comboBox1.DrawMode = DrawMode.OwnerDrawVariable;
comboBox1.ColumnWidths = "45;260";
comboBox1.DataSource = deneme;

I saw combobox's dataSource when bind data starts zero and spoil my text. Below MessageBox line showed me that so.

sbyte byteCounter = 0;
		private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
		{
			byteCounter = Convert.ToSByte(byteCounter + 1);
			if (byteCounter != 0)
			{
				btnGenerate.Visible = true;
				string actualSelectedText;
				actualSelectedText = comboBox1.GetItemText(comboBox1.SelectedItem);
				int index = actualSelectedText.IndexOf(' ');
				splitchar = actualSelectedText.Substring(0, index);
			}
			else
			{
				btnGenerate.Visible = false;
			}
			igetRecordID = comboBox1.SelectedIndex;
			MessageBox.Show(igetRecordID.ToString());
		}