How to add combobox item from one form to another form combobox

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I have 1 main form in that form i have one combobox named Select Treatment with no items in it i.e it is empty and below there is a button named Start new treatment. On button click a new form appears and in that form i have one combobox with some items in it and a save button. the problem is when i clicked the save button the selected item from combobox must transfer to the main form combobox . how do i do ? please help !

What I have tried:

Start new treatment Button on Main form code:

public void button1_Click(object sender, EventArgs e)
{
Form2 f2 = new Form2();
f2 .Show ();
}

On button click new form appears with combobox with some items in it and a save button.
Save Button Code:

private void button1_Click(object sender, EventArgs e)
{
TreatmentInformation tn = new TreatmentInformation();
tn.comboBox2.Items.Add (comboBox1.SelectedItem);

}

Posted 9-Feb-18 3:22am

Member 13670141

Updated 9-Feb-18 3:57am

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Ziee-M 9-Feb-18 9:30am

whats are you using (WPF, Winforms, asp.net)?

Member 13670141 9-Feb-18 9:49am

vsiual c# windows form application

2 solutions

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Ziee-M · Answer 1 · 2018-02-09T03:47:00

Here is 2 solutions for your problem.
-1-Sol 1 : Add a parentForm refernce for all non main form.
=> when you create a new form, you init your Parentform prop :

C#

Form2 f2 = new Form2();
f2.ParentForm = myParentForm;
f2 .Show ();

When you are about to close the Form2 using f2_Closing event, you call your parent method that fills the Combobox.
-2-Sol 2 : Subscribe to f2_closing event in your main form:

Form2 f2 = new Form2(); 
f2.FormClosed += new FormClosedEventHandler(f2_Closed);

When the form2 is closed the

f2_Closed

event will be executed and you can init your combobox.

RickZeeland · Answer 2 · 2018-02-09T03:57:00

Solution 2

In Program.cs create a public variable e.g. comboVar:

public static class Program
{
    public static string comboVar;

And access it in your forms like this:

tn.comboBox2.Items.Add (Program.comboVar);

Posted 9-Feb-18 3:57am

RickZeeland

Updated 9-Feb-18 6:12am

v2