Validate one of the two textbox values
Markup page
Please enter on of at least one contact point:
<asp:CustomValidator ID="ContactInfoAlert" runat="server"
ErrorMessage="CustomValidator" OnServerValidate="CustomValidator_ServerValidate">
</asp:CustomValidator>
User email:
<asp:TextBox ID="EmailTbx" runat="server" ToolTip="Enter email." >
</asp:TextBox>
User phone:
<asp:TextBox ID="PhoneTbx" runat="server" ToolTip="Enter phone number." >
</asp:TextBox>
<asp:Button ID="Btn1" runat="server" Text="Next" CausesValidation="true"/>
Code-behind page
Protected Sub Btn1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Handles Btn1.Click
Dim usrEmail As TextBox = Btn1.FindControl("EmailTbx") 'user email
Dim usrPhone As TextBox = Btn1.FindControl("PhoneTbx") 'user phone
'validate contact info - at least one required
If usrEmailTbx.Text = "" AndAlso usrPhoneTbx.Text = "" Then
ContactInfoAlert.ErrorMessage = "Enter email or phone!"
Else
'your code whatever it might be
End If
End Sub
Public Sub CustomValidator_ServerValidate(ByVal source As Object,
ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs)
args.IsValid = True
If memEmailTbx.Text = "" AndAlso memPhoneTbx.Text = "" Then
ContactInfoAlert.ErrorMessage = "Enter email or phone!"
args.IsValid = False
End If
End Sub
Result
Enter email or phone!
User email:
User phone: