Custom validator to compare

Question

For an exercise I have to compare if 2 textboxes contain the same text with a custom validator (doing the same thing as a comparevalidator does) BUT I cant use a compare validator for this. I have to use the custom validator for this.

It has to compare TextBox1 and TextBox2, if these don't contain the same value ( text) it have to give the error message: not the same value!

How can I solve this?

This is what I have so far:

Markup:

<asp:TextBox ID="TextBox2" runat="server" />
<asp:TextBox ID="TextBox3" runat="server" />
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Not the same value !" ControlToValidate="TextBox2" onservervalidate="CustomValidator1_ServerValidate" />

And This is what I tried to do in code-behind:

protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
{
    if (TextBox2.ToString() != TextBox3.ToString())
    {
        Label1.Text = "Not the same values";
        // don't exactly know what to do in here in order to put it in the error message
    }
}  

Answer 1

protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
    {
        if (TextBox2.Text != TextBox3.Text)
        {
            Label1.Text = "Not the same values";
            args.IsValid = false;
        }
      }

Answer 2

Refer this Discussion .its about your Question and it has a solution

Check this

Updated:

Try this :

<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
    <asp:Button ID="Button1" runat="server" Text="Button" />
<asp:CustomValidator ID="CustomValidator1" runat="server" 
ErrorMessage="Not the same value !" ControlToValidate="TextBox2" onservervalidate="CustomValidator1_ServerValidate"></asp:CustomValidator>




protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
    {
        if (TextBox2.Text == TextBox3.Text)
        {
            args.IsValid = true;

        }
        else
        {

            args.IsValid = false;
        }
    }