create textbox that gets 0 or 1strings

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C#

How can I create a textbox that just gets 0 or 1 strings?

Please help me.

Thanks

Posted 12-Jun-11 21:10pm

Member 7904482

Updated 12-Jun-11 21:46pm

Dalek Dave

v3

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Dalek Dave 13-Jun-11 3:46am

Edited for Grammar.

6 solutions

Solution 2

Hello Dear
first you must set MaxLength property of TextBox to 1 which determines user can not insert more than 1 character in TextBox then in event handler of KeyPress event of TextBox write this code

C#

if (e.KeyChar == '0' || e.KeyChar == '1')
    return;
else
    e.Handled = true;

Posted 12-Jun-11 21:17pm

Reza Mansoori

Comments

Member 7904482 13-Jun-11 3:19am

it is just for character but I need for Strings

Sergey Alexandrovich Kryukov 13-Jun-11 3:21am

No, this is for string, all correct. Try it and you will see...
--SA

Sergey Alexandrovich Kryukov 13-Jun-11 3:21am

My 5 for the answer.
--SA

Sergey Alexandrovich Kryukov 13-Jun-11 3:24am

Please see my solution. For UI using text box is ridiculous.
--SA

Member 7904482 13-Jun-11 3:25am

but it has this error
'System.Windows.Forms.KeyEventArgs' does not contain a definition for 'KeyChar' and no extension method 'KeyChar' accepting a first argument of type 'System.Windows.Forms.KeyEventArgs' could be found (are you missing a using directive or an assembly reference?)

Tarun.K.S 13-Jun-11 3:37am

I have given a detailed explanation in my answer. Check it out.

Dalek Dave 13-Jun-11 3:47am

'tis a fine answer, arrghhh!

Solution 5

Add the following event-handler in the constructor:

C#

textBox1.KeyPress += new KeyPressEventHandler(textBox1_KeyPress);

Event:

C#

void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if ((e.KeyChar.Equals('0')) || (e.KeyChar.Equals('1')))
    {
        e.Handled = false;
    }
    else
    {
        e.Handled = true;
    }
}

Posted 12-Jun-11 21:31pm

Tarun.K.S

Comments

Dalek Dave 13-Jun-11 3:47am

Good Call.

Tarun.K.S 13-Jun-11 3:56am

Thank you!

Solution 3

bind a textChangedEvent to the textbox and add a code like this :

C#

private void textBox1_TextChanged(object sender, KeyEventArgs e)
{
    if (!((e.KeyCode >= Keys.D0 && e.KeyCode <= Keys.D1) || (e.KeyCode >= Keys.NumPad0 && e.KeyCode <= Keys.NumPad1) && !e.Shift))//limit keys into 0,1,num0 and num1
    {
        e.SuppressKeyPress = true;//self explanatory
    }
}

Posted 12-Jun-11 21:19pm

Firo Atrum Ventus

Comments

Member 7904482 13-Jun-11 3:22am

I use this but it accepts all other things
Does it need else Condition?

Firo Atrum Ventus 13-Jun-11 3:45am

Nah, it should've worked fine if you limit set maxlength to 1

Dalek Dave 13-Jun-11 3:48am

Ought to work, don't know why OP is having probs.

Solution 1

Use an if condition to check the text entered is 0 or 1 and Why don't you show the error message if it is other than 0 or 1.

Posted 12-Jun-11 21:15pm

m@dhu

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-06-12T21:24:00

Solution 4

Bad idea to use a text box for it. Use two radio buttons or a combo box or a list box with just two values. Selecting (or checking in case of radio button) will mean 0, second one 1; use appropriate label or text items to show to the user which one is what.

—SA

Posted 12-Jun-11 21:24pm

Sergey Alexandrovich Kryukov

Comments

Member 7904482 13-Jun-11 3:26am

I need text box to get different 0,1 Strings

Sergey Alexandrovich Kryukov 13-Jun-11 3:50am

No you don't I daresay; it would by ugly.
--SA

Dalek Dave 13-Jun-11 3:47am

Sage Advice!

Sergey Alexandrovich Kryukov 13-Jun-11 3:50am

Thank you, Dalek.
--SA

thatraja 13-Jun-11 4:02am

Best idea, 5

Sergey Alexandrovich Kryukov 13-Jun-11 4:36am

Thank you, Raja.
--SA

Tarun.K.S 13-Jun-11 4:04am

Good advice. 5+

Sergey Alexandrovich Kryukov 13-Jun-11 4:37am

Thank you, Tarun.
--SA

MaulikDusara · Accepted Answer · 2011-06-12T21:38:00

it is working fine.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar != Convert.ToChar( "0" )&& e.KeyChar != Convert.ToChar( "1"))
            {
                e.KeyChar = char.MinValue;
            }
        }
    }
}

create textbox that gets 0 or 1strings

6 solutions

Solution 2

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Solution 3

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