Passing value between forms and UserControl

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I have in my project multiple forms, In the main form i have an instance of an UserControl, a button and a label, when I press the button is open the second form and set in a label a value from the database, press OK from form2, the value in passed to a label on form 1.

How i can get the same value in a label in my instance of usercontrol?

Posted 17-Jun-11 14:17pm

aciobanita

Updated 17-Jun-11 14:37pm

Sergey Alexandrovich Kryukov

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Sergey Alexandrovich Kryukov 17-Jun-11 20:19pm

Add a tag: Forms, so experts new it's not WPF, ASP.NET or something else.
...OK, I've done it for you; next time, always tag such things.

--SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-06-17T14:36:00

You need to add an event to your UserControl and fire this event when a value is set and confirmed. Let's call this event ValueSet.

C#

public class ValueSetEventArgs : System.EventArgs {
    internal ValueSetEventArgs(string value) { this.fValue = value; }
    public string FValue { get {return fValue; } }
    string fValue;
} //class ValueSetEventArgs

//...

public class MyUserControl {

    //...

    public System.EventHandler<ValueSetEventArgs> ValueSet;
    void SetValue(string value) {
        //do what you already did...
        if (this.ValueSet != null)
            this.ValueSet.Invoke(this, new ValueSetEventArgs(value));
    } //SetValue

} //class MyUserControl

You form #1 should add an event handler to this instance of your MyCustomControl. This event can set the value of your label or whatever else:

C#

class MyForm Form {
    
    public MyForm {
        InitializeComponent();
        MyUserControl.ValueSet += (sender, eventArgs) => {
            MyLabel.Text = eventArgs.Value;
            // or whatever else
        } //MyUserControl.ValueSet
    } //MyForm

    //...

    // normally called in InitializeComponent,
    // I just show it as manual code:
    Label MyLabel = new Label();
    MyUserControl MyUserControl = new MyUserControl();

} //class MyForm

Problem solved.

—SA