Enable/Diasble button w/ 2 conditions.

[csharp learner]

Hi currently with 1 combobox,textbo x and a OK button which the button will enabled once my textbox is not empty.

private void locacodeBox_TextChanged(object sender, EventArgs e)
        {
            TextBox textBox = sender as TextBox;
            if (locacodeBox.Text.Length == 0)
                locacodeBox.Tag = false;
            else
                locacodeBox.Tag = true;
            ValidateButton();
        }

        private void ValidateButton()
        {
            this.newlocaBtn.Enabled = (bool)locacodeBox.Tag;
        }

But now i want to add the condition where both the combobox and textbox is also not empty then the button will enable...how can i do so?

[IanWright]

A few points:

1) TextBox textBox = sender as TextBox;

You have cast the sender to a TextBox yet you never use it.

2) That looks like a really bad way to use a Tag. Why not have something more like this:

2)

private void locacodeBox_TextChanged(object sender, EventArgs e)
{
   if((String.IsNullOrEmpty(this.textbox.Text) && String.IsNullOrEmpty(this.locacodeBox.Text) == false)
   {
       this.newlocaBtn.Enabled = true;
   }
   else
   {
      this.newlocaBtn.Enabled = false;
   }
}

or

private void locacodeBox_TextChanged(object sender, EventArgs e)
{
       // Notice the ! to invert the result. If both are not empty...
       this.newlocaBtn.Enabled = !(String.IsNullOrEmpty(this.textbox.Text) && String.IsNullOrEmpty(this.locacodeBox.Text);
}

[csharp learner]

Thanks IanWright for your suggestions.

But currently the button enable is still not based on when the comboBox and twxtBox is not empty.

[csharp learner]

I've accomplish my goal in this code but I'm sure there is a shorter and easier way to the solution.

        public Boolean validatetext;
        public Boolean validacombobox;


private void locacodeBox_TextChanged(object sender, EventArgs e) 
{
    if (textBox1.Text.Length == 0)
        validatetext = false;
    else
        validatetext = true;
    ValidateButton(); 
}

private void comboBox1_TextChanged(object sender, EventArgs e)
{
    if (comboBox1.Text.Length == 0)
        validacombobox = false;
    else
        validacombobox = true;
    ValidateButton();
}

private void ValidateButton()
{
    if (validacombobox == true && validatetext == true)
        this.button2.Enabled = true; 
    else
        this.button2.Enabled = false; 
}

[tlhintoq]

button2.Enabled = comboBo1.SelectedItem > -1 && string.IsNullOrEmpty(TextBox1.Text);