Backspace function in C#

Question

1.00/5 (1 vote)

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hi guys i want to program a backspace function for my Scientific Calculator Project i coded something like this

private void button48_Click(object sender, EventArgs e)

{

textBox_Result.Text = textBox_Result.Text.Remove(textBox_Result.Text.Len gth - 1);

if (isOperationPerformed == true)

{

textBox_Result.Text = textBox_Result.Text;

}

else if (textBox_Result.Text == "")

{

textBox_Result.Text = "0";

}

i want this code to work only when operation is not performed but if operation performed true then it should not work but it not seems to work

What I have tried:

Tried if else type functions but that doesn't worked :(

Posted 4-Oct-17 1:31am

Vicky Malhotra

Updated 4-Oct-17 1:49am

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Karthik_Mahalingam · Answer 1 · 2017-10-04T01:49:00

Solution 2

use SendKeys.Send Method (String) (System.Windows.Forms)[^]

private void button1_Click(object sender, EventArgs e)
       {
           textBox1.Focus();
           SendKeys.Send("{BACKSPACE}");
       }

Posted 4-Oct-17 1:49am

Karthik_Mahalingam

Comments

Vicky Malhotra 4-Oct-17 8:12am

Thanks but it's not that what i want :|

Vicky Malhotra 4-Oct-17 8:39am

Here is my source code~ https://pastebin.com/USeeZXuF
If you can figure this then pls do thanks

Karthik_Mahalingam 4-Oct-17 23:39pm

what you are trying to achieve

CPallini · Answer 2 · 2017-10-04T01:42:00

Solution 1

private void button48_Click(object sender, EventArgs e)
{
   if (isOperationPerformed == true)
   {
    // do nothing
   }
   else if (textBox_Result.Text.Length > 0)
   {
     textBox_Result.Text = textBox_Result.Text.Remove(textBox_Result.Text.Length - 1);   
   }
 
}

Posted 4-Oct-17 1:42am

CPallini

Comments

Vicky Malhotra 4-Oct-17 8:10am

Hey thanks man it works only when i use isOperationPerforemed == false but it also works when operation is not performed i want to remove the text if operation is not performed.
Here is my source code~ https://pastebin.com/USeeZXuF

CPallini 4-Oct-17 8:52am

And how do you tell that 'operation is not performed'?

Vicky Malhotra 4-Oct-17 8:56am

you can see my source code: https://pastebin.com/USeeZXuF
i defined bool isOperationPerformed = false;
=|

CPallini 4-Oct-17 9:08am

Probably I don't get you. Do you mean that nothing happens (no character removal) when (isOperationPerformed == false) ?

Vicky Malhotra 4-Oct-17 9:17am

No :( it not removes anything when i define false and when i define true it removes even when operation is performed!

CPallini 4-Oct-17 9:34am

You have two variables:
isOperationPerformed (boolean) and OperationPerformed (string).
What should do the Backspace handler in the following cases:
isOperationPerofmed OperationPerformd
1 false (empty string)
2 false (not empty string)
3 true (empty string)
4 true (not empty string)
?

Vicky Malhotra 4-Oct-17 9:36am

Oh so i need to define other variable for that? Actually i'm noob :(

CPallini 4-Oct-17 9:40am

Actually you don't have to. But you did, in your code.

Vicky Malhotra 4-Oct-17 9:44am

But it's not working out, what's the problem? :/

CPallini 4-Oct-17 9:49am

Really I don't know. I am not able to understand what you are trying to do with such a handler.