In C#, How do I call a function and pass it text from a text box in the main_form, and return the user modified text to the calling function? I have tried delegates to no avail.

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Hello ,

C#

private void button1_Click(object sender, System.EventArgs e)
{
        WiFi_Fast_Setup_Form1 fs = new WiFi_Fast_Setup_Form1();
           // I need to pass NetworkName_tB.Text to the fs Form, and back again, 
           // once it is modified by the user.
        fs.Show();
}

Posted 16-Mar-14 14:53pm

JimOr

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-03-16T18:59:00

This is the popular question about form collaboration. The most robust solution is implementation of an appropriate interface in form class and passing the interface reference instead of reference to a "whole instance" of a Form. Please see my past solution for more detail: How to copy all the items between listboxes in two forms[^].

Please also see other solutions in this discussion. If the application is simple enough, the solution could be as simple as declaring of some internal property in one form and passing a reference to the instance of one form to the instance of another form. For more complex projects, such violation of strictly encapsulated style and loose coupling could add up the the accidental complexity of the code and invite mistakes, so the well-encapsulated solution would be preferable.

Please see also:
http://en.wikipedia.org/wiki/Accidental_complexity[^],
http://en.wikipedia.org/wiki/Loose_coupling[^].

—SA

syed shanu · Answer 2 · 2014-03-16T15:40:00

Solution 1

Hi,

In your case try like this.
In your form button click

C#

 WiFi_Fast_Setup_Form1 objfrm= new WiFi_Fast_Setup_Form1(textbox1.Text);
if (objfrm.ShowDialog() == DialogResult.OK)
           {
textbox1.Text=objfrm.newModifiedtext;
}

In WifiFast_Setup_form1 place on Ok and cancel button

C#

public String newModifiedtext= "";
      public  WiFi_Fast_Setup_Form1(String txtvalues)
      {
          InitializeComponent();
          newModifiedtext= txtvalues;
                  
      }

//In Ok button Click

  private void btnOK_Click(object sender, EventArgs e)
        {
            newModifiedtext="Now adding new text for test";
        }

Posted 16-Mar-14 15:40pm

syed shanu

Comments

JimOr 16-Mar-14 22:49pm

Thank you for the response, I tried to impliment what you suggested,
it looks like you are pointing me in the right direction,
but I seem to be missing something.
Do you have a complete simple code project for this sample so I could run it and see how it works?
Thank You Very Kindly,
Jim

syed shanu 16-Mar-14 22:56pm

this is very simple one as i tld u create main form and in that button click call another form but in that for you need to pass argumet as contructor to that form and in popup form init method you can get the arument data and store that result in public variable just do same like above code it will work.In your pop up form place 2 button as Ok and cancel .in cancel button no need to write anything and in Ok button write same like above it will solve ur problem.there also another method as you can create a pulic class and declare static public variable you can access that class public variable in any of your forms with in your project.

syed shanu 16-Mar-14 22:58pm

if you cont do that send me your mail id i will send you simple code program.

JimOr 16-Mar-14 23:23pm

Syed,
Thank you for your suggestion, I will try to get it working as you say.
Will try and sent comment tomorrow.
Kindly,
Jim

syed shanu 17-Mar-14 0:38am

The Simplay will be as create a Static Class and declare all your globalvariable there,and access the public variable in all you class .
public static class pubClass
{

public static string pubTxtValues
{
get;
set;
}

}

private void button1_Click(object sender, EventArgs e)
{
frmpopup objfrm = new frmpopup(textBox1.Text);
pubClass.pubTxtValues = textBox2.Text;
if (objfrm.ShowDialog() == DialogResult.OK)
{
textBox1.Text = objfrm.newModifiedtext;

}
textBox2.Text = pubClass.pubTxtValues;
}

JimOr 18-Mar-14 0:16am

Thank you all for the good suggestions and code examples.
I will be trying to implement the suggested code in my project.
Will post more as I get things to work.
Kindly,
Jim

JimOr 18-Mar-14 10:55am

Thanks for your help, I got the code to work:

From the main form button click I have:

private void button1_FastSetup1(object sender, System.EventArgs e)
{
WiFi_Fast_Setup_Form1 fs = new WiFi_Fast_Setup_Form1(
NetworkName_tB.Text,
PassPhrasetBox.Text,
emailServer_tB.Text,
To_Email_textBox.Text,
CC_Email_tB.Text,
BCC_textBox.Text,
subject_TxtBox.Text,
rTBox_Body_Message.Text
);
fs.Show();
}

In the new form I have:

public partial class WiFi_Fast_Setup_Form1 : Form
{
public WiFi_Fast_Setup_Form1(string N_name,
string PW_text,
string emailsrver,
string to_text,
string cc_text,
string bcc_text,
string sub_text,
string body_text)

{
InitializeComponent();

tBox_NetName.Text = N_name;
tBox_passPhrase.Text = PW_text;
textBox_emailServer.Text = emailsrver;
textBox_To.Text = to_text;
textBox_cc.Text = cc_text;
textBox_bcc.Text = bcc_text;
textBox_subject.Text = sub_text;
textBox_Body.Text = body_text;
}

JimOr 18-Mar-14 10:57am

Now all I have to do is return all the user modified data to the calling function,
How do I do that ?

Thanks/

syed shanu 18-Mar-14 20:52pm

I have CLREALY TOLD YOU THAT THERE MANY WAYS TO PASS AND RETURN VALUE FROM ONE FORM TO ANOTHER FORM.
1) YOU CAN USE GLOBAL VARIABLE .AS I ALREADY TOLD YOU CAN CREATE A PUBLIC STATIC CLASS AND CREATE A PUBLI VARIABLE AND YOU CAN ACCESS THOSE VARIABLES IN ALL FORMS.
2) IF YOU WANT TO PASS DATA FROM ONE FORM TO ANOTHER FORM.THE POP UP FORM YOU NEED TO MAKE AS FORM DIALOG.
CHK THIS LINK FOR HOW TO MAKE A FORM AS FORMDIALOG.
http://syncor.blogspot.kr/2010/05/creating-c-form-dialog.html
REST IS YOU HAVE TO DO AS I TOLD IN MY SOLUTION.
NOTE IN POPUP FORM YOU HAVE TO SET THE PROBERTY OK OK BUTTON "DIALOGRESUTL=OK".IF YOU NOT MAKE THIS PROPERTY TO OK THEN if (objfrm.ShowDialog() == DialogResult.OK)
{
textbox1.Text=objfrm.newModifiedtext;
}
THIS WILL FAIL AND NOT RETURN THE DATA FROM POPUP FORM.
TRY WITH MY SOLUTION AND .IF YOU CONT DO THAT TELL ME YOUR MAIL ID I WILL SEND YOU MY SIMPLE PROGRAM.