C# read the text of dynamically created text box from other methode

Question

If I created a textbox dynamically like this:

private void Form1_Load(object sender, EventArgs e)
{
   TextBox tb=new TextBox();
   ...
   this.Controls.Add(tb);
}

and if I have a button on my form and I want to read the text of the textbox from within the button click event handler

private void button1_Click(object sender, EventArgs e)
{
 if(**tb.text**=="something") do something;
}

The problem is that I can't find the textbox control in the button handler.

Thank you in advance

score 1 · Accepted Answer · answered Jan 07 '13 at 16:14

1

you have to declare texbox out of the method,it has to be global. then you can reach textbox object

TextBox tb;
private void Form1_Load(object sender, EventArgs e)
{
  tb=new TextBox();
  ...
  this.Controls.Add(tb);
}

answered Jan 07 '13 at 16:14

Mustafa Ekici

7,263
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score 0 · Answer 2 · answered Jan 07 '13 at 16:14

0

Declare TextBox as your Form class private member.

answered Jan 07 '13 at 16:14

Hamlet Hakobyan

32,965
6
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68

score 0 · Answer 3 · answered Jan 07 '13 at 16:19

0

You could iterate through the Controls collection of an enumerable object like a TabControl, assuming this is a Windows form. Here's some from a project I'm working on, adapted for TextBox:

foreach (TabPage t in tcTabs.TabPages)
{
    foreach (Control c in t.Controls)
    {
        MessageBox.Show(c.Name);  // Just shows the control's name.

        if (c is TextBox)    // Is this a textbox?
        {
            if (c.Name == "txtOne")  // Does it have a particular name?
            {
                TextBox tb = (TextBox) c;  // Cast the Control as a TextBox

                tb.Text = "test";  // Then you can access the TextBox control's properties
            }
        }
    }
}

answered Jan 07 '13 at 16:19

Darth Continent

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Couldn't you just call `.FindControl(..)` for the textbox in question? – marc_s Jan 07 '13 at 17:52
Ahh almost, the answer [here](http://stackoverflow.com/questions/4483912/find-a-control-in-c-sharp-winforms-by-name) describes a `.Find(..)` method presumably for an enumerable container like the `TabControl`. Not sure about `FindControl`, might it only apply to ASP .NET? – Darth Continent Jan 07 '13 at 19:53
Yeah, the question isn't conclusive on whether it's ASP.NET / web or Windows forms... and yes - `.FindControl()` is specific to ASP.NET – marc_s Jan 07 '13 at 19:54

score 0 · Answer 4 · answered Jan 07 '13 at 16:25

0

private TextBox tb = new TextBox();
private void Form1_Load(object sender, EventArgs e)
{
  this.Controls.Add(tb);
}

answered Jan 07 '13 at 16:25

spajce

7,044
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C# read the text of dynamically created text box from other methode

4 Answers4