Need help with code C# WinForm

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I am building a Winform Application in which the application has to show I label whatever the user types from Keyboard.

The problem is:
When a key is pressed along with SHIFT both small and capial form of the letter is shown in label

eample :

A + SHIFT --> aA

but I need to show only "A"

here is my code:

C#

if ((e.Modifiers == Keys.Shift) && e.KeyCode >= Keys.A && e.KeyCode <= Keys.Z)
           {


              String s = e.KeyCode.ToString();
            List c = s.ToList();
              c.RemoveAt(c.Count);
              lbl_by_user.Text += s;
           }

I also tried this (I found it in StackOverflow) but it didn't work

C#

string data= "/temp string";

//If we want to remove the first character / we can do by alot of ways such as :

data.Remove(0,1);
data.TrimStart('/');
data.Substring(1);

Such kind of problem have been solved many times. So I googled it but couldn't
find the solution.

Any kind of help would be appreciated

Posted 13-Jan-15 6:31am

BibhutiAlmighty

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Sergey Alexandrovich Kryukov 13-Jan-15 13:19pm

Why not simply using TextBox?
—SA

BillWoodruff 13-Jan-15 22:47pm

Are you willing to use a pop-up TextBox to enter Text, and when it is closed, a Label is created and appears in its place ? I can help you with that.

BibhutiAlmighty 14-Jan-15 8:19am

Yes. I would appreciate that

BillWoodruff 14-Jan-15 17:49pm

And what determines where this Label will appear when it is created ? Where the mouse went down on a Form, or ... ? More details, please.

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-01-13T07:25:00

All your mistakes step from the fact that you don't understand that strings are immutable. Say, System.String.Remove doesn't not remove anything, it does not modify the string at all but returns a brand-new string each time. Therefore, don't use System.String at all for calculating your data, use only the Label.Text property to assign the whole string on each change. (You even can use System.String for those calculations, but it will be awkward and inefficient.)

How to calculate data on keyboards events? Either use System.Collections.Generic.List<code><char></char> or System.Text.StringBuilder (consider it as the mutable version of string type). Read the documentation on these types; everything is clear and simple, well explained.

—SA

Richard MacCutchan · Answer 2 · 2015-01-13T07:17:00

See http://msdn.microsoft.com/en-us/library/ms171534(v=vs.110).aspx[^], for the best ways of handling keyboard input.

As to your second question, you need to remember that strings are immutable; i.e. cannot be changed. You need to store the result of the method that is changing it, like:

C#

data = data.TrimStart('/');
data = data.Substring(1);
// etc

A look at the documentation would have made this clear.

Pushkar Prabhu · Answer 3 · 2015-01-13T07:28:00

Solution 3

Try doing this :

C#

string s = e.KeyCode.ToString();
lbl_by_user.Text = s;

Posted 13-Jan-15 7:28am

Pushkar Prabhu

Need help with code C# WinForm

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