How to set item in DropDownList when DropDownList don't have item. 

In asp.net simple code

```
<asp:DropDownList ID="DropDownList1" runat="server">
    <asp:ListItem>C#</asp:ListItem>
    <asp:ListItem>VB</asp:ListItem>
    <asp:ListItem>java</asp:ListItem>
</asp:DropDownList>

protected void Page_Load(object sender, EventArgs e)
{
   TextBox1.Text = "php";
   if ( DropDownList1.Text == TextBox1.Text)
   {
       DropDownList1.Text = TextBox1.Text;
    }
    else
    {
       TextBox2.Text = TextBox1.Text;
     }
}

```