How Can I Efficiently Access Form Controls from Another Form in C#?

Accessing Form Controls from Another Form

In a scenario where you have multiple forms and need to access controls belonging to a different form, seeking efficient methods is crucial. One approach involves creating a setter property in one form and referencing it from the other. However, enhancing this communication further is possible.

Introducing the concept of Singleton forms is one potential solution. However, it may not be the most optimal solution in all circumstances. Instead, consider passing a reference of one form to another.

Sample Implementation:

In this example, the main form (Form1) triggers the opening of another form (Form2). To facilitate communication, Form2 takes the calling form as an argument during its instantiation, providing a reference to its members. This opens up various communication possibilities.

Form1:

public Form1()
{
    InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
    Form2 frm = new Form2(this);
    frm.Show();
}

public string LabelText
{
    get { return Lbl.Text; }
    set { Lbl.Text = value; }
}

Form2:

public Form2()
{
    InitializeComponent();
}

private Form1 mainForm = null;
public Form2(Form callingForm)
{
    mainForm = callingForm as Form1;
    InitializeComponent();
}

private void Form2_Load(object sender, EventArgs e)
{
}

private void button1_Click(object sender, EventArgs e)
{
    this.mainForm.LabelText = txtMessage.Text;
}

By adopting this approach, communication between forms becomes more flexible, empowering you to access controls and manipulate data as needed.

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