Send values from one form to another form

Question

I want to pass values between two Forms  c    How can I do it   I have two forms  Form1 and Form2    Form1 contains one button  When I click on that button  Form2 should open and Form1 should be in inactive mode  i e not selectable    Form2 contains one text box and one submit button  When I type any message in Form2 s text box and click the submit button  the Form2 should close and Form1 should highlight with the submitted value   How can i do it  Can somebody help me to do this with a simple example

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I ve worked on various winform projects and as the applications gets more complex  more dialogs and interactions between them  then i ve started to use some eventing system to help me out  because management of opening and closing windows manually will be hard to maintain and develope further    I ve used CAB for my applications  it has an eventing system but it might be an overkill in your case    You could write your own events for simpler applications

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This is very simple  suppose you have 2 window form Form1 and Form2 and you want to send record of textbox1 from Form1 to Form2 and display this record in label1 of Form2  then in Form2 create a label which name is label1 and go to the property of label1 and set  Modifiers  public and in Form one create a textBox with id textBox1 and a button of name submit then write the following code on button click event  button1 Click object sender  EventArgs e      Form2 obj new Form2      obj label1 text textBox1 text ToString      obj show        thats it    for this way you can bind dataset record to another form s datagridview

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Form1 Code    private void button1 Click object sender  EventArgs e                Form2 f2   new Form2                f2 ShowDialog                MessageBox Show  Form1 Message    Form2 t Text     can put label also in form 1 to show the value got from form2     Form2 Code            public Form2                         InitializeComponent                t   textBox1                           Initialize with static textbox                   public static TextBox t new TextBox        make static to get the same value as inserted         private void button1 Click object sender  EventArgs e                         this Close                 It Works

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How to pass the values from form to another form  1   Goto Form2 then Double click it  At the code type this   public Form2 string v      InitializeComponent      textBox1 Text   v      2   Goto Form1 then Double click it  At the code type this    At your command button in Form1  private void button1 Click object sender  EventArgs e       Form2 F2   new Form2 textBox1 Text      F2 Show

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Ok so Form1 has a textbox  first of all you have to set this Form1 textbox to public in textbox property    Code Form1   Public button1 click         Form2 secondForm   new Form2 this       secondForm Show        Pass Form1 as this in the constructor   Code Form2   Private Form1  firstForm   Public Form2 Form1 firstForm         firstForm   firstForm     Public button click          firstForm textBox text label1 text      This Close

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Constructors are the best ways to pass data between forms or Gui Objects you can do this  In the form1 click button you should have   Form1 Enable   false  Form2 f   new Form2    f ShowDialog      In form 2  when the user clicks the button it should have a code like this or similar   this Close    Form1 form   new Form1 textBox1 Text  form Show      Once inside the form load of form 1 you can add code to do anything as you get the values from constructor

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How about using a public Event  I would do it like this   public class Form2      public event Action lt string gt  SomethingCompleted      private void Submit Click object sender  EventArgs e              SomethingCompleted  Invoke txtData Text          this Close             and call it from Form1 like this   private void btnOpenForm2 Click object sender  EventArgs e        using  var frm   new Form2                  frm SomethingCompleted    text   gt                this txtData Text   text                      frm ShowDialog              Then  Form1 could get a text from Form2 when Form2 is closed  Thank you

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private void button1 Click object sender  EventArgs e            Form2 frm2   new Form2 textBox1 Text           frm2 Show               public Form2 string qs                InitializeComponent            textBox1 Text   qs

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You can make use of a different approach if you like    Using System Action   Here you simply pass the main forms function as the parameter to the child form like a callback function  OpenForms Method   You directly call one of your open forms    Using System Action  You can think of it as a callback function passed to the child form      -------- IN THE MAIN FORM --------     CALLING THE CHILD FORM IN YOUR CODE LOOKS LIKE THIS Options frmOptions   new Options UpdateSettings   frmOptions Show        YOUR FUNCTION IN THE MAIN FORM TO BE EXECUTED public void UpdateSettings string data          DO YOUR STUFF HERE       -------- IN THE CHILD FORM --------  Action lt string gt  UpdateSettings   null      IN THE CHILD FORMS CONSTRUCTOR public Options Action lt string gt  UpdateSettings        InitializeComponent        this UpdateSettings   UpdateSettings     private void btnUpdate Click object sender  EventArgs e           CALLING THE CALLBACK FUNCTION     if  UpdateSettings    null          UpdateSettings  some data        OpenForms Method   This method is easy  2 lines   But only works with forms that are open  All you need to do is add these two lines where ever you want to pass some data   Main frmMain    Main Application OpenForms  Main    frmMain UpdateSettings  Some data      I provided my answer to a similar question here

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There are several solutions to this but this is the pattern I tend to use      Form 1    inside the button click event using Form2 form2   new Form2           if form2 ShowDialog      DialogResult OK                 someControlOnForm1 Text   form2 TheValue            And        Inside Form2    Create a public property to serve the value public string TheValue        get   return someTextBoxOnForm2 Text

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if you change Modifiers Property of a control in a Form to Public  another Forms can access to that control  f e          Form2 frm      private void Form1 Load object sender  EventArgs e                frm   new Form2            frm Show              private void button1 Click object sender  EventArgs e                MessageBox Show frm txtUserName Text              txtUserName is a TextBox with Modifiers Public

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Define a property  public static class ControlID         public static string TextData   get  set        In the form2  private void button1 Click object sender  EventArgs e          ControlID TextData   txtTextData Text         Getting the data in form1 and form3  private void button1 Click object sender  EventArgs e           string text   ControlID TextData

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In form 1 public static string Username   Me      In form 2 s load block string  UserName   Form1 Username

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After a series of struggle for passing the data from one form to another i finally found a stable answer  It works like charm   All you need to do is declare a variable as public static datatype  variableName  in one form and assign the value to this variable which you want to pass to another form and call this variable in another form using directly the form name  Don t create object of this form as static variables can be accessed directly  and access this variable value   Example of such is   Form1  public static int quantity  quantity TextBox1 text    Value which you want to pass   Form2  TextBox2 Text Form1 quantity    Data will be placed in TextBox2

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In this code  you pass a text to Form2  Form2 shows that text in textBox1  User types new text into textBox1 and presses the submit button  Form1 grabs that text and shows it in a textbox on Form1   public class Form2   Form       private string oldText       public Form2 string newText  this                 oldText   newText          btnSubmit DialogResult   DialogResult OK             private void Form2 Load object sender  EventArgs e                textBox1 Text   oldText             public string getText                 return textBox1 Text             private void textBox1 KeyUp object sender  KeyEventArgs e                if  e KeyCode    Keys Enter                        DialogResult   System Windows Forms DialogResult OK                      And this is Form1 code   public class Form1 Form       using  Form2 dialogForm   new Form2  old text to show in Form2                  DialogResult dr   dialogForm ShowDialog this           if  dr    DialogResult OK                        tbSubmittedText   dialogForm getText                      dialogForm Close

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declare string in form1 public string TextBoxString   in form1 click event add  private void button1 Click object sender  EventArgs e                Form1 newform   new Form1            newform   this          this Hide            MySecform   new Form2 ref newform           MySecform Show            in form2 constructer  public Form2 ref Form1 form1handel                firstformRef   form1handel          InitializeComponent            in form2 crate variable Form1 firstformRef   private void Submitt Click object sender  EventArgs e                firstformRef TextBoxString   textBox1 Text          this Close            firstformRef Show

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Declare a public string in form1  public string getdata    In button of form1  form2 frm  new form2    this hide    form2 show      To send data to form1 you can try any event and code following in that event  form1 frm  new form1    form1 getdata  some string to be sent to form1     Now after closing of form2 and opening of form1  you can use returned data in getdata string

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you can pass as parameter the textbox of the Form1  like this   On Form 1 buttom handler   private void button2 Click object sender  EventArgs e    Form2 newWindow   new Form2 textBoxForReturnValue   newWindow Show         On the Form 2  public static TextBox textBox2     class atribute  public Form2 TextBox textBoxForReturnValue        textBox2  textBoxForReturnValue     private void btnClose Click object sender  EventArgs e         textBox2 Text   dataGridView1 CurrentCell Value ToString   Trim        this Close

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You can use this   Form1 button1 click  private void button1 Click object sender  EventArgs e        Form2 frm2   new Form2        this Hide        frm2 Show        And add this to Form2  public string info         Form2 button1 click  private void button1 Click object sender  EventArgs e         info   textBox1 Text      this Hide        BeginInvoke new MethodInvoker      gt                Gogo                public void Gogo         Form1 frm   new Form1        frm Show        frm Text   info

[c#] Send values from one form to another form

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[c#] Send values from one form to another form

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