How to Access Form Controls From User Control | C# Winforms

[@kentofuu]

What if we want to add a form inside a panel from user control by clicking a button inside user control?
((Panel)posForm.Controls.Find("controlPanelCust", true)[0]).Controls.Add(new FormPOS());
Throws an error "Top Level control cannot be added to a control", but i already set Top Level = false on the FormPOS. So, how to add a form inside a panel on other form based on user button click?

[@AaricAaiden]

This is how it is done:
// access panel on a form and add a new form
var panel = form1.Controls.Find("panel1", true).FirstOrDefault() as Panel;
Form2 f2= new Form2();
f2.TopLevel = false;
f2.Dock = DockStyle.Fill;
panel.Controls.Add(f2);
f2.Show();

[@kentofuu]

I have
1. User control that named ucCustomer
2. Form that named FormPOS
3. Form that named FormPOS_Cars
Sorry... Why it doesn't work? The panel won't changing.. I have this btnSelect_Click event on my user control, if the button in user control get clicked, I want the form inside the panel (which the panel on the formPOS, not in user control) changing to FormPOS_Cars
private void btnSelect_Click(object sender, EventArgs e)
{
var controlPanel = this.Parent as Panel;
var posForm = controlPanel.TopLevelControl as Form;
((Label)posForm.Controls.Find("lblCust", true)[0]).Text = lblName.Text;
FormPOS formPOS = new FormPOS();
var panel = formPOS.Controls.Find("controlPanelCust", true).FirstOrDefault() as Panel;
FormPOS_Cars carPOS = new FormPOS_Cars();
carPOS.TopLevel = false;
carPOS.Dock = DockStyle.Fill;
panel.Controls.Add(carPOS);
carPOS.Show();
}

[@rubenaguillonsegura3521]

Worked great, thanks!

[@ahad123able]

How can we pass label or any texts from form to user controls? Thanks a lot

[@AaricAaiden]

Constructor Method: Pass data through the constructor of the target form when creating an instance of it.
// Form1.cs
private void button1_Click(object sender, EventArgs e)
{
string data = textBox1.Text;
Form2 form2 = new Form2(data); form2.Show();
}
// Form2.cs
public Form2(string data)
{
InitializeComponent();
label1.Text = data;
}

[@ahad123able]

@@AaricAaiden thank you sir! But i was asking you how to pass to user control not a form , if u can help me

[@AaricAaiden]

@@ahad123able
1. In the UserControl, create a public property to store the text:
public partial class MyUserControl : UserControl
{
public string Text { get; set; }
public MyUserControl()
{
InitializeComponent();
}
}
2. In the Form, create an instance of the UserControl and set its "Text" property:
public partial class MyForm : Form
{
public MyForm()
{
InitializeComponent();
MyUserControl myUserControl = new MyUserControl();
myUserControl.Text = "This is some text";
this.Controls.Add(myUserControl);
}
}
3. In the UserControl, access the Text property to display the text:
public partial class MyUserControl : UserControl
{
public string Text { get; set; }
public MyUserControl()
{
InitializeComponent();
label1.Text = Text;
}
}

[@fetrush6383]

hi the code you provided above is not working for me i replace everything as it be but still not working :(@@AaricAaiden