Get All Installed Printers
using System.Drawing.Printing;
protected void Page_Load(object sender, EventArgs e)
{
foreach (string IPrinter in PrinterSettings.InstalledPrinters)
RadioButtonList1.Items.Add(IPrinter);
}
Add this control on .Aspx page
<asp:RadioButtonList ID="RadioButtonList1" runat="server">
</asp:RadioButtonList>