How to transfer data from one form to another form in windows forms?

Let's say you have forms A and B; A is the main form, and you want form B to display when you click some button in A. Convenient way to do so is having B show in dialog fashion, which prevents you from clicking anywhere else in the application until it is closed.

On B you need a "public" property; the public modifier means that other classes may access that property to read it or modify it. So have in B something like...

private string Btext = String.Empty;

public string _Btext
{
    get {return Btext;}
    set {Btext = value;}
}

And suppose you have a textbox (textbox1) and a button (button1) in B that triggers...

private void button1_Click(object sender, EventArgs e)
{
   _Btext = textbox1.Text; //gives the textbox value to the property
   this.Close(); //closes B form
}

So now you have a public property in B, so any other class that creates an instance of B will be able to access that value.


Now, on A let's have a button (buttonDisplayB) which displays B and let's you fetch its value...

private void buttonDisplayB_Click(object sender, EventArgs e)
{
  B formB = new B(); //Creates an instance of form B
  formB.ShowDialog(); //Displays B in dialog form, so you can enter text and close with button

  //if you close B on UI with button1, you'll have the value available in the public property
  
  string valueFromB = formB._Btext;
  //now you have B's value in A
}

make object of the form and access the all controls.

and

another is make a public variable on first page and access this on second form.

You can declare a variable in Form1 as

public static string cus_name = "";

then assign customer name to this static variable as cus_name = CustomerNametxt.Text;


then access customer name in ComplainAssignment form as below

string cus_name=Form1.cus_name

Hi just create one module page and declare public variable,for eg if u create variable in module

Public form1var  As String = "" ' This is vb chnage to c#

u can use anywhere in whole project.

just pass data in Form1.cs
" form1var=ur data"

and get in ComplainAssignment.cs page as "form1var"