Wiek: 
<asp:TextBox ID="TextBox1" Runat="server"></asp:TextBox>
 &nbsp;
<asp:RangeValidator ID="RangeValidator1" Runat="server" 
 ControlToValidate="TextBox1" Type="Integer"
 Text="Wiek musi by pomidzy 30 i 40" 
 MaximumValue="40" MinimumValue="30"></asp:RangeValidator>
