How to send string value to another form when opening it?

Question

0.00/5 (No votes)

See more:

I have a Form1 where i open a new Form2 with button click.
Every time i click that button in Form1, i would like to pass a
string value to Form2 code.
How can this be done?
I have tried to study this, and tried several examples, but the examples i found was not quite the same.
Please help, and thanks in advance.

Simo

What I have tried:

Tried some examples from the net. Tried to figure it out myself, but have no clue...

Posted 9-Mar-16 23:31pm

Member 12302635

Updated 9-Mar-16 23:54pm

Add a Solution

Comments

asplover1 10-Mar-16 5:34am

can you please show your code what you are using to open the form 2

Member 12302635 10-Mar-16 5:46am

private void button4_Click(object sender, Eventargs e)
{
Form2 showG = new Form2();
showG.Show();
}

like this, so nothing much here :)

Member 12302635 10-Mar-16 5:50am

I just want to open another window to show "results graphics" in a picture.
I need the string with the path and filename to be sent over, which i have ready on Form1.
If there is another way to do this (i.e. usercontrol or whatever, please point it out...)

2 solutions

Solution 2

Hello ,
There are several example available in Google .
try these
1. Passing Data Between Forms
2. How to pass the Value one form to another form in windows form

Thanks

Posted 9-Mar-16 23:54pm

Animesh Datta

Comments

Member 12302635 10-Mar-16 6:09am

Went through the Google and some other paths, but it wasn't what i looked for.
I know there's good examples and blog around the net like this one:
http://geek-goddess-bonnie.blogspot.com/2011/01/passing-data-between-forms.html
But this was just a little detail in a bigger project, that i wanted to find just simplest thisng. And yes i'm a newbie, and that's why i sometimes need help from the net :)

Animesh Datta 10-Mar-16 6:30am

Never forget Google your friend . If you search properly then you should get right answer .not an issue but The above links explain enough for your basic requirement .

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2016-03-09T23:43:00

Solution 1

Create a constructor for the second form which accepts a string parameter:

C#

public Form2(string s)
   {
   // Do something with your string
   ...
   }

Then when you construct the form instance, pass your value:

C#

Form2 myForm2Instance = new Form2("Hello World!");
myForm2Instance.Show();

Posted 9-Mar-16 23:43pm

OriginalGriff

Comments

Member 12302635 10-Mar-16 6:06am

Thanks for this solution. All other found from Google, or other sources were way more complicated for this simple thing.

Member 12302635 10-Mar-16 6:11am

And yes, i'm a newbie. I tried "something" like this and quit too quickly.. :)

OriginalGriff 10-Mar-16 6:20am

:laugh:
We're all guilty of that from time to time!

Member 12302635 10-Mar-16 6:55am

One more newbie question, why can't i use a string like this:
Form2 myForm2Instance = new Form2(sMyfilepath);
i can write it like that, but its always null on the other side??

OriginalGriff 10-Mar-16 7:19am

You can - and it'll work fine.
string myString = "Hello World!";
...
Form2 myForm2Instance = new Form2(myString);
myForm2Instance.Show();
It'll only be null if the string variable you are passing has not been assigned a value.
Put a breakpoint on the constructor, and see what the debugger says! (You do know how to use the debugger, yes?)

Member 12302635 10-Mar-16 8:16am

Oops, that's right. the assigned value obviously came null before i pressed the button, but i got it working! Thanks to your support.

OriginalGriff 10-Mar-16 8:22am

You're welcome!