Run code when both text boxes are empty

Question

In C# how do you display an error message if both text boxes are empty? Is there a code example or validator that can be used?

Answer 1

RequiredFieldValidator should do the job? if you want to know more about validators then look here http://www.codeproject.com/KB/validation/aspnetvalidation.aspx

Answer 2

protected submit_click() { if((TextBox1.Text=="")||(TextBox2.Text=="")) { print that error message } }

Answer 3

if (TextBox1.Text == String.Empty && TextBox2.Text == String.Empty)
{
Label1.Text = "Your error message here";
}
else
{
//continue your logic here
}

Answer 4

You will need to use a CustomValidator.

Answer 5

CustomValidator gives you a callback method. You can use it like any other validator, and write the following code in the [control name]_ServerValidate method:

args.IsValid = TextBox1.Text.Length > 0 && TextBox2.Text.Length > 0;

Answer 6

Abstract to a scalable function:

private bool Validate(params TextBox[] boxes) {
    foreach (var box in boxes) 
        if (string.IsNullOrEmpty(box.Text))
            return false;
    return true;            
}

then call with

if(Validate(TextBox1, TextBox2, ...)) { 
    /// Do the good stuff 
} else { 
    /// throw error 
}