Button to work as Backspace key in C#

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Hello,
I am working on a windows form where i am taking a richtextbox and one button now what my query is that i want what so ever is written on my richtextbox must vanish one by one on the hit of that button

Example: lets say my richtextbox has 123 written on it then on the hit of that button first 3 must vanish and then 2 and then 1...

also i have enabled richtextboxs readonly property to true and i have set its max length to 10
i tried

private void button1_Click(object sender, EventArgs e)
        {
            richTextBox1.Text = "\b";
        }

but failed its working like

richTextBox1.Clear();

also i tried

if (richTextBox1.TextLength != 0)
            {
                int x = richTextBox1.TextLength;
                x += -1;
               
            }

but i dont know what to add further

ya and if the cursor is in the middle then too it must remove the text from its current location one by one

Please Please help me out

Thanks & Regards
Radix

Posted 11-May-10 20:34pm

radix3

Updated 16-Nov-20 19:52pm

v3

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Comments

_Damian S_ 12-May-10 2:44am

You say that you want the last character to be removed, but what if the cursor is in the middle of the text somewhere? Would you not want it removed where the cursor is situated?

radix3 12-May-10 3:05am

Thank u Mr.Damian sir for helping me improve my question thank you

7 solutions

Solution 1

Track the position of the cursor. There may or may not be an event for that. If not, then you'll have to detect button clicks, key presses, and focus changes to keep track of that.

Use string.Substring to extract a portion of the string. One you extract it (you'll need two string.Substrings if the cursor is in the middle of the text, so you will then have to concatenate the strings), you will then assign the result back to richTextBox1.Text.

Keep in mind a button click will take focus away from the richtextbox. When the button gets clicked, you will want to restore focus (and restore the position of the cursor to where it was before the button was clicked).

Posted 11-May-10 21:15pm

AspDotNetDev

Solution 4

//This will help the button to work as backspace button. On the click event of button write the following code.

int index = richTextBox1.SelectionStart;
richTextBox1.Text = richTextBox1.Text.Remove(richTextBox1.SelectionStart - 1, 1);
richTextBox1.Select(index - 1, 1);
richTextBox1.Focus();

//This has worked for me.

Posted 6-Feb-12 18:34pm

vishweshh

Solution 7

C#

private void button1_Click(object sender, EventArgs e)
        {
            int i = richTextBox1.Text.Length;
            richTextBox1.Text = richTextBox1.Text.Substring(0, i - 1);
        }

Posted 10-Dec-12 17:19pm

hungduong_hedspi

Solution 9

And even one more alternative in case you always want to remove only the last char:

C#

richTextBox1.Text = richTextBox1.Text.Substring( 0, richTextBox1.Text.Length - 1 );

Posted 5-Sep-13 0:50am

V.Lorz

Comments

[no name] 5-Sep-13 7:04am

Seriously? Do you really think that after 3 years the OP is still waiting for an answer?

Member 15594125 7-Apr-22 8:56am

Great work :)

Solution 8

C#

if (focusedTextbox.SelectionStart>0)
          {
          int index = focusedTextbox.SelectionStart;
          focusedTextbox.Text = focusedTextbox.Text.Remove(focusedTextbox.SelectionStart - 1, 1);
          focusedTextbox.Select(index - 1, 1);
          focusedTextbox.Focus();
      }

Posted 5-Sep-13 0:34am

Member 9871483

Comments

[no name] 5-Sep-13 7:04am

Seriously? Do you really think that after 3 years the OP is still waiting for an answer?

Solution 10

C#

if (richTextBox1.TextLength != 0)
            {
                richTextBox1.Text = richTextBox1.Text.Remove(richTextBox1.Text.Length - 1, 1);
            }
            else { return; }

This Worked for me

Posted 20-Jun-18 2:28am

Member 13879945

Comments

Maciej Los 20-Jun-18 8:49am

8 years too late!

CHill60 21-Jun-18 5:08am

This is just a repost of a solution posted 8 years ago (Solution 2). Don't repost other people's solutions

Member 14597074 18-Sep-19 15:45pm

dont mind those negative nancies your solutions worked perfectly

CHill60 17-Nov-20 11:27am

Ha ha - of course this solution worked perfectly - it was copied from the accepted answer!

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khalid khatri · Accepted Answer · 2010-05-11T23:44:00

Solution 2

Hello

You Write This Code Of Button's Click Event For Back Space

<br />
richTextBox1.Text = richTextBox1.Text.Remove(richTextBox1.Text.Length - 1, 1);<br />

Hope For Help

Posted 11-May-10 23:44pm

khalid khatri

Comments

saloni15 27-May-10 1:04am

Reason for my vote of 5
its easy to implement..

ranjitkumarr 3-Jan-13 7:57am

nice