Dynamically Adding textboxes [Resolved]

Hi, my code creates 10 textboxes, or more if I change the for loop with a variable instead of 10.

All the textboxes are dynamically added. My question is how can I address say the third text box. I.e. in my code I would want to assign different text to each textbox afterwards.

heres my code.

int iLeft = 16;
int iTop = 16;

TextBox txtInput;

for (int i=0;i < 10; i++)
{
txtInput = new TextBox();
txtInput.Location = new Point(iLeft,iTop);
txtInput.Size = new Size(100,35);
txtInput.TabIndex = 1;
txtInput.BorderStyle =0;
txtInput.BackColor = Color.Blue;
txtInput.ForeColor = Color.White;
txtInput.Text = "Input Field #" + i.ToString();
this.Controls.Add(txtInput);
iTop += 30;

}

address how? just make a new collection

Code:

---

CollectionArray c = new CollectionArray();

---

for each textbox u create add it to the collection. then just make

Code:

---

TextBox text = c[3-1]; //3 is the number u want but as the arrays are 0 based subtract 1

---

ps: i dont know if the class name is CollectionArray...i dunno why but i cant remember how it really is :eek:

Cheer m8.

I created an arraylist instead and added however many textbox objects i need with all the position info etc and that seems to work.

I can address each one via the index

ie.

textBox[1].Text = "new text";

You can also add a name to each textbox. Something like:

int iLeft = 16;
int iTop = 16;

TextBox txtInput;

for (int i=0;i < 10; i++)
{
txtInput = new TextBox();
txtInput.Name = "MyTextBox" + i.ToString();
txtInput.Location = new Point(iLeft,iTop);
txtInput.Size = new Size(100,35);
txtInput.TabIndex = 1;
txtInput.BorderStyle =0;
txtInput.BackColor = Color.Blue;
txtInput.ForeColor = Color.White;
txtInput.Text = "Input Field #" + i.ToString();
this.Controls.Add(txtInput);
iTop += 30;

}

That last option sounds good and easier than using an ArrayList, but I tried it and then tried the following

MyTextBox5.Text = "Test Text";

which produces an error
'The type or namespace name could not be found'

This is because it has been added dynamically and the compiler does not recognise MyTextBox5.

How do I set a value in one of the textboxes then?

also how can I respond to events from a textbox that has been dynamically added?

try

this.MyTextBox5.Text = "Test Text";

I don't know if it works, but if your adding it to the control collection of the form, then it should.

Also, I don't know if this will work or need to be done, but maybe you need to add an access modifier in the declaration:

public TextBox txtInput

of course it wont work, C# doesnt allow late binding, if at compile time the control doesnt exist then an error will be thrown by the compiler!
what u can do if u know that each textbox will have a different name is create an hashtable and just do

Code:

---

Hashtable ht = new Hashtable();
//Add it
ht.Add("TEXTBOX", new TextBox());
//Get it
TextBox txt = ht["TEXTBOX"];
MessageBox.show(txt.Text);

---

but i think the easiest method for what you want is using the ArrayList (thats what i meant in my first post but dunno why i confused it will CollectionArray :eek: )

in that code:

Hashtable ht = new Hashtable();
//Add it
ht.Add("TEXTBOX", new TextBox());
//Get it
TextBox txt = ht["TEXTBOX"];
MessageBox.show(txt.Text);


do you know how to respond to an event, say KeyPressed for TEXTBOX?

lol its easy, when declaring the button just "declare" the event..

txtInput += new <delegate that i dont remember but see in the IDE..>

and then create the function that has the same parameters as the delegate and the voi la..

cheer mate, that worked a treat.

I created a .Click event delegate each time I went round the loop, as follows

txtInput[i].Click += new System.EventHandler(txtInput_Clicked);


and then when user clicks on any textbox that was dynamically created, I have the following method (with sender you can detect which object was clicked)

private void txtInput_Clicked(object sender, System.EventArgs e)
{

TextBox txtCurrent = (TextBox) sender;
MessageBox.Show("Text Box Clicked " + txtCurrent.Text);

}

:D

yeah that was the idea :D