search the products according to the radio button select

<asp:RadioButtonList ID="RadioButtonList1" runat="server" AutoPostBack="True">
        <asp:ListItem>Search1</asp:ListItem>
        <asp:ListItem>Search2</asp:ListItem>
        <asp:ListItem>Search3</asp:ListItem>
    </asp:RadioButtonList>
    <asp:Button ID="Button6" runat="server" style="height: 26px" Text="Button" />

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
If RadioButtonList1.Text = "Search1" Then
Search1() ''call function for search1
 Else If RadioButtonList1.Text = "Search2" Then
Search2 ''call function for search2
 Else If RadioButtonList1.Text = "Search3" Then
Search3() ''call function for search3
End If
  End Sub

Private Sub Search1()
''search according to the condition
End Sub

Private Sub Search2()
''search according to the condition
End Sub

Private Sub Search3()
''search according to the condition
End Sub

<asp:RadioButtonList ID="RadioButtonList1" runat="server" AutoPostBack="True">
        <asp:ListItem>Naveen</asp:ListItem>
        <asp:ListItem>Kumar</asp:ListItem>
        <asp:ListItem>aaaa</asp:ListItem>
    </asp:RadioButtonList>
    <asp:Button ID="Button6" runat="server" style="height: 26px" Text="Button" />

Protected Sub Button6_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button6.Click
      con = New SqlConnection(ConfigurationManager.ConnectionStrings("con").ConnectionString)
      If con.State = ConnectionState.Closed Then
          con.Open()
      End If

      da = New SqlDataAdapter("select * from sample where name='" + RadioButtonList1.SelectedItem.Text + "'", con)
      ds = New DataSet()
      da.Fill(ds)
      GridView1.DataSource = ds
      GridView1.DataBind()
  End Sub