Select several textboxes in a panel

Question

I have several textboxes nested in a panel and I want to check if they have text or not. Although I don't want to write my code like this:

if(textbox1.Text != "" && textbox2.Text != "" ...) 
{
    ...
}

Is there any way to automate this and improve the general quality of the code itslef?

Answer 1

This can be done very easily by using OfType and All extension methods from System.Linq.

var panel = new Panel
{
    Size = new Size(500, 500),
    BackColor = Color.Red
};

panel.Controls.Add(new TextBox { Text = "Value" });
panel.Controls.Add(new TextBox { Text = "Value2" });

if (panel.Controls.OfType<TextBox>().All(x => !string.IsNullOrEmpty(x.Text)))
{
    //Do something
}

The code in the if statement will only execute if all the Text properties of TextBoxes are not empty.