How to Make a Text Box Equal All Letters To The Left of a Specific Letter or Character From Another Text Box in C#

Question

I am trying to figure out a simple way of making a text box equal all letters to the left of a "-" in another text box. Basically, if an end-user types blah-test in textbox1, I would like textbox2 to equal blah. I have tried if statements and substrings based off of letter position count (i.e. substring(0, 5); however, this got very lengthy and impractical, since the words entered into textbox1 can be any length.

Thank you,

DFM

Answer 1

Try this:

if(textbox2.text.Contains("-"))
{
  textbox1.text = textbox2.text.Split("-")[0];
}

Here we first check if textbox2 contains the - character and if it does we split the text in two parts and set the text of textbox1 to the part that is left of the first - character.

Answer 2

it's very simple

select and double click on the OnTextChange event on textbox1

Write this code inside textbox1_OnTextChange:

string text = textbox1.Text;
textbox2.text = text.Substring(0, text.indexOf("-"));

and you're done!