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Button to return the value of a variable string

How do I get a return value from a Button Click event?What is the difference between String and string in C#?How do you give a C# Auto-Property a default value?Case insensitive 'Contains(string)'How do I get a consistent byte representation of strings in C# without manually specifying an encoding?Get int value from enum in C#back to the previous page with values still present in textboxesIs there a reason for C#'s reuse of the variable in a foreach?Windows Application - Custom Event is getting called multiple timesSample onedrive winforms app vb.netHttpWebRequest from a local WCF service

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1

Can a button return the value of a variable?is it possible? I'm new in winform so...understand me. The final goal is to have a simple code with two buttons that if clicked return a msgbox with the value of a var.

private string button3_Click(object sender, EventArgs e)

 string res = "PASS";
 MessageBox.Show(res);
 return res;


private string button4_Click(object sender, EventArgs e)

 string res = "FAIL";
 MessageBox.Show(res);
 return res;

c# winforms

share|improve this question

edited Mar 28 at 8:32

Matt Clegg

9333 silver badges1313 bronze badges

asked Mar 28 at 7:21

codroipocodroipo

881010 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You are already doing it when you are passing res value to MessageBox.Show(res)
  
  – iSahilSharma
  Mar 28 at 7:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You could write: private void DisplayMessage(string message) MessageBox.Show(message); and then call this method in both button click function like: DisplayMessage(res);
  
  – Prashant Pimpale
  Mar 28 at 7:24
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Who is supposed to consume the value returned?
  
  – Dmitry Bychenko
  Mar 28 at 7:24
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of How do I get a return value from a Button Click event?
  
  – SᴇM
  Mar 28 at 7:25
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  oh hi again @DmitryBychenko,the returned value is going to be used by another app in wpf
  
  – codroipo
  Mar 28 at 7:27
  

  
  
  
  

 | 
show 3 more comments

1

Can a button return the value of a variable?is it possible? I'm new in winform so...understand me. The final goal is to have a simple code with two buttons that if clicked return a msgbox with the value of a var.

private string button3_Click(object sender, EventArgs e)

 string res = "PASS";
 MessageBox.Show(res);
 return res;


private string button4_Click(object sender, EventArgs e)

 string res = "FAIL";
 MessageBox.Show(res);
 return res;

c# winforms

share|improve this question

edited Mar 28 at 8:32

Matt Clegg

9333 silver badges1313 bronze badges

asked Mar 28 at 7:21

codroipocodroipo

881010 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You are already doing it when you are passing res value to MessageBox.Show(res)
  
  – iSahilSharma
  Mar 28 at 7:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You could write: private void DisplayMessage(string message) MessageBox.Show(message); and then call this method in both button click function like: DisplayMessage(res);
  
  – Prashant Pimpale
  Mar 28 at 7:24
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Who is supposed to consume the value returned?
  
  – Dmitry Bychenko
  Mar 28 at 7:24
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of How do I get a return value from a Button Click event?
  
  – SᴇM
  Mar 28 at 7:25
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  oh hi again @DmitryBychenko,the returned value is going to be used by another app in wpf
  
  – codroipo
  Mar 28 at 7:27
  

  
  
  
  

 | 
show 3 more comments

Can a button return the value of a variable?is it possible? I'm new in winform so...understand me. The final goal is to have a simple code with two buttons that if clicked return a msgbox with the value of a var.

private string button3_Click(object sender, EventArgs e)

 string res = "PASS";
 MessageBox.Show(res);
 return res;


private string button4_Click(object sender, EventArgs e)

 string res = "FAIL";
 MessageBox.Show(res);
 return res;

c# winforms

share|improve this question

edited Mar 28 at 8:32

Matt Clegg

9333 silver badges1313 bronze badges

asked Mar 28 at 7:21

codroipocodroipo

881010 bronze badges

private string button3_Click(object sender, EventArgs e)

 string res = "PASS";
 MessageBox.Show(res);
 return res;


private string button4_Click(object sender, EventArgs e)

 string res = "FAIL";
 MessageBox.Show(res);
 return res;

share|improve this question

edited Mar 28 at 8:32

Matt Clegg

9333 silver badges1313 bronze badges

asked Mar 28 at 7:21

codroipocodroipo

881010 bronze badges

share|improve this question

edited Mar 28 at 8:32

Matt Clegg

9333 silver badges1313 bronze badges

asked Mar 28 at 7:21

codroipocodroipo

881010 bronze badges

edited Mar 28 at 8:32

Matt Clegg

9333 silver badges1313 bronze badges

edited Mar 28 at 8:32

Matt Clegg

9333 silver badges1313 bronze badges

asked Mar 28 at 7:21

codroipocodroipo

881010 bronze badges

asked Mar 28 at 7:21

codroipocodroipo

881010 bronze badges

2 Answers
2

active

oldest

votes

1

Well, button3_Click and alike are so-called callback functions which are called by system and that's why do not return any value (the system doesn't need it). Let's extract a method:

private string MyButtonClick(object sender) 
 string result = "";

 if (sender == button3) 
 result = "PASS"; //TODO: better read it from resources, not hadcoded
 else if (sender == button4) 
 result = "FAIL"; //TODO: better read it from resources, not hadcoded

 if (!string.IsNullOrEmpty(result))
 MessageBox.Show(result); 

 return result; 

And then you can put:

// System callback function

// void: System callback function signature
private void button3_Click(object sender, EventArgs e) 
 MyButtonClick(sender); 


// void: System callback function signature
private void button4_Click(object sender, EventArgs e) 
 MyButtonClick(sender); 
 

Or

// custom code

string myClickMessage = MyButtonClick(button4);

share|improve this answer

answered Mar 28 at 7:34

Dmitry BychenkoDmitry Bychenko

122k1515 gold badges115115 silver badges150150 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  you'll never disappoint me,that was a easy shot...thank you so much dmitry...again
  
  – codroipo
  Mar 28 at 7:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  only a little improovement th types of the buttons is void not string
  
  – codroipo
  Mar 28 at 7:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @mad codroipo: sure, it should be void: void button3_Click and void button4_Click
  
  – Dmitry Bychenko
  Mar 28 at 7:48
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the only remaining question is how could i pick up the result from another app and insert it into a db?
  
  – codroipo
  Mar 28 at 7:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @mad codroipo: applications interaction (if "another app" is a different exe file) is a difficult procedure (say, both exe establish named pipe(s) and send data to it in order to interact). If "another app" is just another form of the same exe all you have to do is to modify MyButtonClick (e.g. write code to save the message into RDBMS)
  
  – Dmitry Bychenko
  Mar 28 at 7:56
  

  
  
  
  

 | 
show 3 more comments

0

Click event handlers have strongly typed signature, i.e. the return type must be void, so you cannot return anything from them.

But, if you are working with windows Forms, you have class for your form, where you placed those event hadnlers. So what you can do is: define private variable:

pirvate string _res;

and then assign it value in your click event hadlers, eg.:

private string button3_Click(object sender, EventArgs e)

 _res = "PASS";
 MessageBox.Show(_res);

Then in the code you could use this value as you want.

If you want to use it outside your class, define property:

public string Res

 get return _res; 

share|improve this answer

answered Mar 28 at 7:35

Michał TurczynMichał Turczyn

20.4k1313 gold badges2424 silver badges4242 bronze badges

add a comment | 

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1

Well, button3_Click and alike are so-called callback functions which are called by system and that's why do not return any value (the system doesn't need it). Let's extract a method:

private string MyButtonClick(object sender) 
 string result = "";

 if (sender == button3) 
 result = "PASS"; //TODO: better read it from resources, not hadcoded
 else if (sender == button4) 
 result = "FAIL"; //TODO: better read it from resources, not hadcoded

 if (!string.IsNullOrEmpty(result))
 MessageBox.Show(result); 

 return result; 

And then you can put:

// System callback function

// void: System callback function signature
private void button3_Click(object sender, EventArgs e) 
 MyButtonClick(sender); 


// void: System callback function signature
private void button4_Click(object sender, EventArgs e) 
 MyButtonClick(sender); 
 

Or

// custom code

string myClickMessage = MyButtonClick(button4);

share|improve this answer

answered Mar 28 at 7:34

Dmitry BychenkoDmitry Bychenko

122k1515 gold badges115115 silver badges150150 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  you'll never disappoint me,that was a easy shot...thank you so much dmitry...again
  
  – codroipo
  Mar 28 at 7:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  only a little improovement th types of the buttons is void not string
  
  – codroipo
  Mar 28 at 7:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @mad codroipo: sure, it should be void: void button3_Click and void button4_Click
  
  – Dmitry Bychenko
  Mar 28 at 7:48
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the only remaining question is how could i pick up the result from another app and insert it into a db?
  
  – codroipo
  Mar 28 at 7:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @mad codroipo: applications interaction (if "another app" is a different exe file) is a difficult procedure (say, both exe establish named pipe(s) and send data to it in order to interact). If "another app" is just another form of the same exe all you have to do is to modify MyButtonClick (e.g. write code to save the message into RDBMS)
  
  – Dmitry Bychenko
  Mar 28 at 7:56
  

  
  
  
  

 | 
show 3 more comments

1

Well, button3_Click and alike are so-called callback functions which are called by system and that's why do not return any value (the system doesn't need it). Let's extract a method:

private string MyButtonClick(object sender) 
 string result = "";

 if (sender == button3) 
 result = "PASS"; //TODO: better read it from resources, not hadcoded
 else if (sender == button4) 
 result = "FAIL"; //TODO: better read it from resources, not hadcoded

 if (!string.IsNullOrEmpty(result))
 MessageBox.Show(result); 

 return result; 

And then you can put:

// System callback function

// void: System callback function signature
private void button3_Click(object sender, EventArgs e) 
 MyButtonClick(sender); 


// void: System callback function signature
private void button4_Click(object sender, EventArgs e) 
 MyButtonClick(sender); 
 

Or

// custom code

string myClickMessage = MyButtonClick(button4);

share|improve this answer

answered Mar 28 at 7:34

Dmitry BychenkoDmitry Bychenko

122k1515 gold badges115115 silver badges150150 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  you'll never disappoint me,that was a easy shot...thank you so much dmitry...again
  
  – codroipo
  Mar 28 at 7:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  only a little improovement th types of the buttons is void not string
  
  – codroipo
  Mar 28 at 7:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @mad codroipo: sure, it should be void: void button3_Click and void button4_Click
  
  – Dmitry Bychenko
  Mar 28 at 7:48
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the only remaining question is how could i pick up the result from another app and insert it into a db?
  
  – codroipo
  Mar 28 at 7:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @mad codroipo: applications interaction (if "another app" is a different exe file) is a difficult procedure (say, both exe establish named pipe(s) and send data to it in order to interact). If "another app" is just another form of the same exe all you have to do is to modify MyButtonClick (e.g. write code to save the message into RDBMS)
  
  – Dmitry Bychenko
  Mar 28 at 7:56
  

  
  
  
  

 | 
show 3 more comments

Well, button3_Click and alike are so-called callback functions which are called by system and that's why do not return any value (the system doesn't need it). Let's extract a method:

private string MyButtonClick(object sender) 
 string result = "";

 if (sender == button3) 
 result = "PASS"; //TODO: better read it from resources, not hadcoded
 else if (sender == button4) 
 result = "FAIL"; //TODO: better read it from resources, not hadcoded

 if (!string.IsNullOrEmpty(result))
 MessageBox.Show(result); 

 return result; 

And then you can put:

// System callback function

// void: System callback function signature
private void button3_Click(object sender, EventArgs e) 
 MyButtonClick(sender); 


// void: System callback function signature
private void button4_Click(object sender, EventArgs e) 
 MyButtonClick(sender); 
 

Or

// custom code

string myClickMessage = MyButtonClick(button4);

share|improve this answer

answered Mar 28 at 7:34

Dmitry BychenkoDmitry Bychenko

122k1515 gold badges115115 silver badges150150 bronze badges

private string MyButtonClick(object sender) 
 string result = "";

 if (sender == button3) 
 result = "PASS"; //TODO: better read it from resources, not hadcoded
 else if (sender == button4) 
 result = "FAIL"; //TODO: better read it from resources, not hadcoded

 if (!string.IsNullOrEmpty(result))
 MessageBox.Show(result); 

 return result; 

// System callback function

// void: System callback function signature
private void button3_Click(object sender, EventArgs e) 
 MyButtonClick(sender); 


// void: System callback function signature
private void button4_Click(object sender, EventArgs e) 
 MyButtonClick(sender); 
 

// custom code

string myClickMessage = MyButtonClick(button4);

share|improve this answer

answered Mar 28 at 7:34

Dmitry BychenkoDmitry Bychenko

122k1515 gold badges115115 silver badges150150 bronze badges

answered Mar 28 at 7:34

Dmitry BychenkoDmitry Bychenko

122k1515 gold badges115115 silver badges150150 bronze badges

answered Mar 28 at 7:34

Dmitry BychenkoDmitry Bychenko

122k1515 gold badges115115 silver badges150150 bronze badges

0

Click event handlers have strongly typed signature, i.e. the return type must be void, so you cannot return anything from them.

But, if you are working with windows Forms, you have class for your form, where you placed those event hadnlers. So what you can do is: define private variable:

pirvate string _res;

and then assign it value in your click event hadlers, eg.:

private string button3_Click(object sender, EventArgs e)

 _res = "PASS";
 MessageBox.Show(_res);

Then in the code you could use this value as you want.

If you want to use it outside your class, define property:

public string Res

 get return _res; 

share|improve this answer

answered Mar 28 at 7:35

Michał TurczynMichał Turczyn

20.4k1313 gold badges2424 silver badges4242 bronze badges

add a comment | 

0

Click event handlers have strongly typed signature, i.e. the return type must be void, so you cannot return anything from them.

But, if you are working with windows Forms, you have class for your form, where you placed those event hadnlers. So what you can do is: define private variable:

pirvate string _res;

and then assign it value in your click event hadlers, eg.:

private string button3_Click(object sender, EventArgs e)

 _res = "PASS";
 MessageBox.Show(_res);

Then in the code you could use this value as you want.

If you want to use it outside your class, define property:

public string Res

 get return _res; 

share|improve this answer

answered Mar 28 at 7:35

Michał TurczynMichał Turczyn

20.4k1313 gold badges2424 silver badges4242 bronze badges

add a comment | 

Click event handlers have strongly typed signature, i.e. the return type must be void, so you cannot return anything from them.

But, if you are working with windows Forms, you have class for your form, where you placed those event hadnlers. So what you can do is: define private variable:

pirvate string _res;

and then assign it value in your click event hadlers, eg.:

private string button3_Click(object sender, EventArgs e)

 _res = "PASS";
 MessageBox.Show(_res);

Then in the code you could use this value as you want.

If you want to use it outside your class, define property:

public string Res

 get return _res; 

share|improve this answer

answered Mar 28 at 7:35

Michał TurczynMichał Turczyn

20.4k1313 gold badges2424 silver badges4242 bronze badges

pirvate string _res;

private string button3_Click(object sender, EventArgs e)

 _res = "PASS";
 MessageBox.Show(_res);

public string Res

 get return _res; 

share|improve this answer

answered Mar 28 at 7:35

Michał TurczynMichał Turczyn

20.4k1313 gold badges2424 silver badges4242 bronze badges

answered Mar 28 at 7:35

Michał TurczynMichał Turczyn

20.4k1313 gold badges2424 silver badges4242 bronze badges

answered Mar 28 at 7:35

Michał TurczynMichał Turczyn

20.4k1313 gold badges2424 silver badges4242 bronze badges