how to validate multiple TextBoxes with a MessageBox when clicked on "next"? visual studio(c# Winforms)

Question

I have a form that comprises 16 jtextboxes and 6 comboBoxes, and I want to validate all of them at once, or at least all jtextboxes at once and all comboBoxes at once. I have done that, but the problem is I use MessageBox as the validation to all of them and the MessageBox keeps on showing up after clicking on "Ok" or "Cancel".

Here is my code:

 private void bunifuFlatButton1_Click(object sender, EventArgs e) {
 userform3 form3 = new userform3();
 var jtextboxes = new[] {
     jTextBox3, jTextBox4, jTextBox5, jTextBox6, jTextBox7, jTextBox8, jTextBox9, jTextBox10, jTextBox11, jTextBox12, jTextBox13, jTextBox14, jTextBox15, jTextBox16
 };
 var comboboxes = new[] {
     comboBox1, comboBox2, comboBox3, comboBox4, comboBox5, comboBox6
 };
 foreach(var jbox in jtextboxes) {
     foreach(var combo in comboboxes) {
         if (string.IsNullOrWhiteSpace(jbox.TextValue) && string.IsNullOrWhiteSpace(combo.Text)) {
             MessageBox.Show("some fields are empty");
         } else {
             form3.Show();
         }
     }

Is there a solution where the MessageBox shows up only once?

Answer 1

You can add a break statement (break;) to break out of the foreach loop once you use MessageBox.Show(). Otherwise you can use a boolean that once the MessageBox is shown, it turns true. Then only show the MessageBox when it's false.