I have 10 textboxes, now i want to check that none of them are empty when a button is clicked. My code is :
if (TextBox1.Text == "")
{
errorProvider1.SetError(TextBox1, "Please fill the required field");
}
Is there any way that I can check all the textboxes at once, rather than writing for every individual?
Yes, there is.
First, you need to obtain all the text boxes in form of a sequence, for instance like this:
var boxes = Controls.OfType<TextBox>();
Then, you can iterate over them, and set the error accordingly:
foreach (var box in boxes)
{
if (string.IsNullOrWhiteSpace(box.Text))
{
errorProvider1.SetError(box, "Please fill the required field");
}
}
I would recommend using string.IsNullOrWhiteSpace instead of x == "" or + string.IsNullOrEmpty to mark text boxes filled with spaces, tabs and the like with an error.
Might not be an optimal solution but this also should work
public Form1()
{
InitializeComponent();
textBox1.Validated += new EventHandler(textBox_Validated);
textBox2.Validated += new EventHandler(textBox_Validated);
textBox3.Validated += new EventHandler(textBox_Validated);
...
textBox10.Validated += new EventHandler(textBox_Validated);
}
private void button1_Click(object sender, EventArgs e)
{
this.ValidateChildren();
}
public void textBox_Validated(object sender, EventArgs e)
{
var tb = (TextBox)sender;
if(string.IsNullOrEmpty(tb.Text))
{
errorProvider1.SetError(tb, "error");
}
}
Edit:
var controls = new [] { tx1, tx2. ...., txt10 };
foreach(var control in controls.Where(e => String.IsNullOrEmpty(e.Text))
{
errorProvider1.SetError(control, "Please fill the required field");
}
