I cannot iterate through textboxes

Question

I am trying to iterate through the textboxes in my window so I can make operations on them. Here is my code:

foreach (Control c in Controls)
{
    if (c is System.Windows.Forms.TextBox)
    {
        MessageBox.Show(c.Name);
    }
}

I have put a breakpoint on the line with if, my program reaches that breakpoint, but it doesn't reach the MessageBox line... Where is the error? (I tested this with c is Button and it worked...)

Are you sure the textboxes are *direct* children of the form? They're not (for example) on panels? — Jon Skeet, Aug 04 '13 at 15:24
actually, they are child of panels... what can I do in this situation, because I also have many panels on this window... — Victor, Aug 04 '13 at 15:25
@Victor `Recursive method` to loop through all the controls on your form is what you need. — King King, Aug 04 '13 at 15:26
Refer to the answer here - http://stackoverflow.com/questions/4863051/loop-through-textboxes — Rohit Vats, Aug 04 '13 at 15:33

King King · Accepted Answer · 2013-08-04T15:42:55.210

3

It's fairly so simple that I don't want to add an answer, but for the OP's request:

private void CheckTextBoxesName(Control root){
    foreach(Control c in root.Controls){
        if(c is TextBox) MessageBox.Show(c.Name);
        CheckTextBoxesName(c);
    }
}
//in your form scope call this:
CheckTextBoxesName(this);
//out of your form scope:
CheckTextBoxesName(yourForm);
//Note that, if your form has a TabControl, it's a little particular to add more code, otherwise, it's almost OK with the code above.

edited Aug 04 '13 at 15:42

answered Aug 04 '13 at 15:37

King King

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I know how to call it :p – Victor Aug 04 '13 at 15:43
@Victor see my edit, it's simple. – King King Aug 04 '13 at 15:44
@keyboardP :)) a humorous downvoter? – King King Aug 04 '13 at 15:46

score 1 · Answer 2 · answered Aug 04 '13 at 15:30

1

This should help you

    foreach (TextBox t in this.Controls.OfType<TextBox>())
    {
         MessageBox.Show(t.Name);
    }

Alternative :

void TextBoxesName(Control parent)
{
    foreach (Control child in parent.Controls)
    {
        TextBox textBox = child as TextBox;
        if (textBox == null)
            ClearTextBoxes(child);
        else
            MessageBox.Show(textbox.Name);
    }
}

    TextBoxesName(this);

answered Aug 04 '13 at 15:30

The first code can't work in the case of the OP, we have only 1 solution in which we use recursive method. – King King Aug 04 '13 at 15:31
@KingKing, post an answer if you know it! – Victor Aug 04 '13 at 15:33

I cannot iterate through textboxes

2 Answers2