Develop Reference

How can I know the index of duplicated text from a selectedtext? [duplicate]

Ok, I'm trying to do something a little specific here. I want to get the location of the selected text in a textbox.
To elaborate- I can use location to select text. If I have a textBox1 I could do:
textBox1.SelectionStart = 1;
textBox1.SelectionLength = 4;
That would start at the second letter and select 4 letters.
What I want to do is the opposite: when the user selects text, I want to find out what the start is and what the length is (or what the start is and what the end is. Either will work).
I thought about just searching the string for the selectedtext (textBox1.SelectedText). The problem comes if it is a common word or a string that is used multiple times. For instance.
This is a cat. This is a cat. This is a cat.
If they select the second sentence, using SelectedText to search the string for that specific sentence does me no good. It could be either of the 3.
So, my question is: When the user clicks a button, how do I determine the exact elements that are selected by the user, so that I can later manipulate those specific elements? Important to note the later part- I likely will not only want to manipulate the text when the button is pressed. I will also want to manipulate it later, at a time when the text may no longer be highlighted. This means I'll want to store SOMETHING to tell me what specific parts of the sentence I'm dealing with. If that solution isn't viable, is there a solution you can think of where, in the above "this is a cat" example, the user could select the second sentence, hit a button, and then later I know which sentence was selected when he hit that button?

According to the documentation, SelectionStart and SelectionLength can be both set and read. Just use those.

You dont even need to know the position of selected text to manipulate them, to edit the text that you have selected in the text you can simple set the SelectedText property to the new edited value.
// if textBox1.text = "Hello World World"; with first "World" selected
textBox1.SelectedText = textBox1.SelectedText.Replace("World", "Raj");
// then it becomes "Hello Raj World"

How to remove a specified characters in labels or controls?

I want to change texts every time that user click on a button. So, if the user clicked on specified button the "✓ " characters will be added to that button's text. also, if the user clicked on another button, That characters will be removed from the specified button's text.
I tried the first code below to add the "✓ " characters and it worked well without problems. Then I tried to remove that characters by replacing + into -
and I got problems. I need now a code to remove that characters from main text and thanks for helping me.
English_Language.Text = "✓ " + English_Language.Text;
//-----------
English_Language.Text = English_Language.Text - "✓ ";

In order to remove a character from a string you cannot just subtract. That is undefined, if there is more than one, what will happen? So you must use one of the methods on the string class in to get the result you want. If you only have one of those characters, or you want them all gone then you can use Replace, otherwise, you can use SubString as follows.
English_Language.Text = English_Language.Text.SubString(1);
Using SubString in this way will skip the first character seeing as that's where you are placing the character.

How To add * in Textbox Starting value and print into label in C#

I have some text boxes in my form where the user need to enter the different prices of article, what I want to do is to automatically add Starting value * whenever text is changed . So when the user types 1 it is displayed like *****1
and text box Length are 6 size fix. then again user type 111 it is display like ***111

Not sure if you are on web, forms or what, but here is what you looking for:
txt1.Text = txt1.Text.PadLeft(6, '*');
Reference: PadLeft

You can use the PadLeft method for a string:
textBox1.Text = textBox1.Text.PadLeft(6, '*');
See an example here: https://dotnetfiddle.net/GPfFsx

horizontal tab escape not working in string.Format [duplicate]

This should be very simple.
I have a Label control on my Form and I am trying to put a tab character between text
Label.Text = "Is there a\ttab";
The output is "Is there atab";
What am I doing wrong?

Tab is actually a non-printing character—or rather, a control character. What it does is entirely dependent on the application. What exactly do you expect? 8 spaces? 4 spaces? As many spaces as needed to get to a multiple of 8 columns? Indentation of the following text by one cm?
To put it short: The Label control doesn't support tabs. Actually, Label just uses normal graphics routines for rendering its text and how should they know what you intend to do with your tab character?
If you need to display that character as a number of spaces, then you should replace it by that number of spaces.

I wanted to add tabs ("\t") to a dropdown list of items. The items have a ToString method that gives about 3 words concatenated together. They did not line up. For example:
1-I 45
123-AB 511
123456-MMM 611
A long list like this is hard to read. So I used string.Format like this:
string.Format("{0,6}-{1,-4} {2}",id,name,num);
The number after the comma will right align/pad if positive and left align/pad if negative.
Then I changed my font in the Combobox to be monospaced, like Courier New, and you get something like this:
1-I 45
123-AB 511
123456-MMM 611
That is much easier for a user to read.

Nothing, windows forms labels are very limited in functionality and don't support the \t character.
A (slightly awkward) alternative might be:
label1.Text = "test\ting\t123".Replace("\t"," ");

Old thread, but since none of the answers seemed to work for me, I will go ahead and throw in my 2 cents. I could not get a "\t" or even use manual spaces to add spacing to the label. What I ended up doing was using alt code alt-255 5 times. This worked like a charm. Gotta love total hacks...

Right, to insert a tab, just add the spaces desired.
If you want to offset the next by a specified length, you could try
int offset_text = 20;
label1.Text = "Is there a".PadRight(offset_text)+"Tab";
label2.Text = "More Text".PadRight(offset_text)+"Too";

Just use a literal string and you should be good to go...
label1.Text = #"Test for Tab";
Where that big space is where I actually hit tab three times...hope this helps

I had the same problem. A textbox does instead a label accept Tabs. So if you change the label in a textbox, the pro

Just click in the arrow at the right of the Text property of the label (click in the Text property content and the drop-down-arrow will show up). A box for text-editing will open, and in that box you can use Enter, Tab, and so on.

Winforms Label Text property not displaying \t tab character

This should be very simple.
I have a Label control on my Form and I am trying to put a tab character between text
Label.Text = "Is there a\ttab";
The output is "Is there atab";
What am I doing wrong?

Tab is actually a non-printing character—or rather, a control character. What it does is entirely dependent on the application. What exactly do you expect? 8 spaces? 4 spaces? As many spaces as needed to get to a multiple of 8 columns? Indentation of the following text by one cm?
To put it short: The Label control doesn't support tabs. Actually, Label just uses normal graphics routines for rendering its text and how should they know what you intend to do with your tab character?
If you need to display that character as a number of spaces, then you should replace it by that number of spaces.

I wanted to add tabs ("\t") to a dropdown list of items. The items have a ToString method that gives about 3 words concatenated together. They did not line up. For example:
1-I 45
123-AB 511
123456-MMM 611
A long list like this is hard to read. So I used string.Format like this:
string.Format("{0,6}-{1,-4} {2}",id,name,num);
The number after the comma will right align/pad if positive and left align/pad if negative.
Then I changed my font in the Combobox to be monospaced, like Courier New, and you get something like this:
1-I 45
123-AB 511
123456-MMM 611
That is much easier for a user to read.

Nothing, windows forms labels are very limited in functionality and don't support the \t character.
A (slightly awkward) alternative might be:
label1.Text = "test\ting\t123".Replace("\t"," ");

Old thread, but since none of the answers seemed to work for me, I will go ahead and throw in my 2 cents. I could not get a "\t" or even use manual spaces to add spacing to the label. What I ended up doing was using alt code alt-255 5 times. This worked like a charm. Gotta love total hacks...

Right, to insert a tab, just add the spaces desired.
If you want to offset the next by a specified length, you could try
int offset_text = 20;
label1.Text = "Is there a".PadRight(offset_text)+"Tab";
label2.Text = "More Text".PadRight(offset_text)+"Too";

Just use a literal string and you should be good to go...
label1.Text = #"Test for Tab";
Where that big space is where I actually hit tab three times...hope this helps

I had the same problem. A textbox does instead a label accept Tabs. So if you change the label in a textbox, the pro

Just click in the arrow at the right of the Text property of the label (click in the Text property content and the drop-down-arrow will show up). A box for text-editing will open, and in that box you can use Enter, Tab, and so on.