How to create multiple textbox at runtime and how can access it?

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3.67/5 (3 votes)

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.NET3.5

I would like to create multiple textbox at runtime using a button click event. And how can i get the textboxes id i.e. how can i access it????
I have implemented to create a multiple textbox at runtime but i can't access it.
Here is the code to create multiple textbox at runtime...

C#

namespace multiple_textbox
{
    public partial class Form1 : Form
    {

        int a = 0;

        public Form1()
        {
            InitializeComponent();
        }

        private void btntxtbx_Click(object sender, EventArgs e)
        {
            a++;

            int count = 0 + a ;
            TextBox[] t = new TextBox[count];
            int x = 70, y = 50;
            for (int i = 0; i < count; i++)
            {
                t[i] = new TextBox();
                if(this.Width!=1152)
                {
                t[i].Location = new System.Drawing.Point(y +(i*65), x);
                t[i].Size = new Size(100, 50);
                t[i].Name = "txtbx" + i.ToString();
                this.Controls.Add(t[i]);
                this.ResumeLayout(false);
                y += 40;
                this.Refresh();
                }
            }

        }

    }
}

Posted 5-Jul-12 1:50am

Shankar23G

Updated 5-Jul-12 1:56am

Stephen Hewison

v2

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valza · Answer 1 · 2012-07-05T02:22:00

set the

C#

TextBox[] t

bigger scope.
Define it in class level.

C#

int a = 0;
     TextBox[] t;

     public Form1()
     {
         InitializeComponent();
     }

     private void btntxtbx_Click(object sender, EventArgs e)
     {
         a++;

         int count = 0 + a;
         t = new TextBox[count];
         int x = 70, y = 50;
         for (int i = 0; i < count; i++)
         {
             t[i] = new TextBox();
             if (this.Width != 1152)
             {
                 t[i].Location = new System.Drawing.Point(y + (i * 65), x);
                 t[i].Size = new Size(100, 50);
                 t[i].Name = "txtbx" + i.ToString();
                 this.Controls.Add(t[i]);
                 this.ResumeLayout(false);
                 y += 40;
                 this.Refresh();
             }
         }

     }

     private void button2_Click(object sender, EventArgs e)
     {
         if (t == null)
             return;

         TextBox t2 = t.Where(o => o.Name == "txtbx0")
             .FirstOrDefault() as TextBox;

         Console.WriteLine("txtBox: "+t2.Name);

     }

Hope this will help you.

bhagirathimfs · Answer 2 · 2012-07-05T02:09:00

Solution 1

Set the Id of each texdtbox
Like

C#

t[i].ID = "TestBox" + i.ToString();

declare that textbox object outside the button click event.
Means:Globaly
Now try to access the textbox using their ID.

One suggestion:
You have written that

int count = 0 + a;

I think no need to write 0 + a instant of that simply write

int count = a;

Posted 5-Jul-12 2:09am

bhagirathimfs

Updated 5-Jul-12 3:58am

v2

Comments

Shankar23G 5-Jul-12 8:18am

I would like to call the textbox object like "txtbx1","txtbx.2"and so on.. how can i access it????

bhagirathimfs 5-Jul-12 8:45am

access means??
I think if you want to add anything
than use like this txtbox1.Text = "Hello"

Shankar23G 5-Jul-12 8:58am

yes i would like to get the txtbox1.Text values???

bhagirathimfs 5-Jul-12 9:04am

than write txtbox1.Text = "hello";
And declare the textbox class
i.e.TextBox[] t = new TextBox[count];
as global so that u can access that textboxes over all the page.
In your case the scope of the textbox is limited to the button click.

bhagirathimfs 5-Jul-12 9:56am

Is this fulfill your requirement????

valza 5-Jul-12 9:07am

Check my solution.
There you can get all TextBox properties including "Text" (by changing t2.Name to t2.Text)

bhagirathimfs 5-Jul-12 9:15am

yes valza also write
Refer his solution also
I suggest to assign the ID of the textbox and access the textbox by ID is good practice.

Sergey Alexandrovich Kryukov · Answer 3 · 2012-07-05T10:52:00

First of all, most likely you will need to access the text boxes later. How? Simply make the reference TextBox[] t accessible during the life time you need. Most usually, you would need to make this array reference a field or a property of your form class. (Only give it a good semantic name; using one-character identifiers is always bad.)

You code has a number of problems to fix. Bad things is all your immediate constants hard-coded in the code: 70, 50, 1142, 65, 100, 50, "txtbx"… Declare then all explicit constants or put in resources. Use a separate panel with docking/padding for a parent of these controls. One apparent problem is the size. You should never assign the height; it should remain default. One apparent problem that you arrange the controls by index without knowing its size. You should do a very different thing; better arrange them vertically and calculate the height to determine the vertical step:

C#

int gap = 4;
for (int i = 0; i < count; i++) {
    t[i] = new TextBox();
    //if (this.Width != 1152) silly check, if will give you always true or always false
    {
       t[i].Location = new System.Drawing.Point(y * (t[i].Height + gap), x); //height it taken into account
       //...
       this.Controls.Add(t[i]);
    }
}

Finally, remove Refresh and ResumeLayout. Sometimes you need ResumeLayout, but certainly out of the loop.

—SA

How to create multiple textbox at runtime and how can access it?

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