Page.IsValid and Validate

ASP.net declarative programming approach, the Page.IsValid method is something easy to forget.





<asp:TextBox ID="TextBox1" runat="server" ValidationGroup="MyValidationGroup">asp:TextBox>

<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1"

ErrorMessage="This 

field is required!" ValidationGroup="MyValidationGroup">asp:RequiredFieldValidator>

<br />

<asp:Button ID="Button1" runat="server" Text="Button" 

ValidationGroup="MyValidationGroup" CausesValidation="true" />

<br />

<br />

<asp:TextBox ID="TextBox2" runat="server" ValidationGroup="AnotherValidationGroup">asp:TextBox>

<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="TextBox2"

ErrorMessage="This 

field is required!" ValidationGroup="AnotherValidationGroup">asp:RequiredFieldValidator>

<br />

<asp:Button ID="Button2" runat="server" Text="Button" ValidationGroup="AnotherValidationGroup" 

OnClick="Button2_Click" /> 

protected void Button2_Click(object sender, EventArgs e) {

    Page.Validate("MyValidationGroup");

    if (!Page.IsValid) {

         return;

    }

    Response.Write("Button was clicked at " + DateTime.Now.ToShortTimeString());

}