Get Access to Parent Control from User Control - C#

Get access to parent control from user control - C#

Description

You can get the parent control using Control.Parent.

Sample

So if you have a Control placed on a form this.Parent would be your Form.

Within your Control you can do

Form parentForm = (this.Parent as Form);

More Information

• MSDN: Control.Parent Property

Update after a comment by Farid-ur-Rahman (He was asking the question)

My Control and a listbox (listBox1) both are place on a Form (Form1). I have to add item in a listBox1 when user press a button placed in my Control.

You have two possible ways to get this done.

1. Use `Control.Parent

Sample

MyUserControl

    private void button1_Click(object sender, EventArgs e)
    {
        if (this.Parent == null || this.Parent.GetType() != typeof(MyForm))
            return;

        ListBox listBox = (this.Parent as MyForm).Controls["listBox1"] as ListBox;
        listBox.Items.Add("Test");
    }

or

2.

• put a property public MyForm ParentForm { get; set; } to your UserControl
• set the property in your Form
• assuming your ListBox is named listBox1 otherwise change the name

Sample

MyForm

public partial class MyForm : Form
{
    public MyForm()
    {
        InitializeComponent();
        this.myUserControl1.ParentForm = this;
    }
}

MyUserControl

public partial class MyUserControl : UserControl
{
    public MyForm ParentForm { get; set; }

    public MyUserControl()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (ParentForm == null)
            return;

        ListBox listBox = (ParentForm.Controls["listBox1"] as ListBox);
        listBox.Items.Add("Test");

    }
}

How to access Parent class function/control from a child user control loaded in a pannel

This may helps:

public partial class Form1 : Form
{
    //Other codes

    private void loadlogin()
    {
        login log = new login(this);    //CHANGE HERE
        mainPannel.Controls.Clear();
        mainPannel.Controls.Add(log);
    }

    //Other codes
}

And

public partial class login : UserControl
{
    Form1 _parent;                       //ADD THIS

    public login(Form1 parent)
    {
        InitializeComponent();
        this._parent = parent;          //ADD THIS
    }

    public void button1_Click_1(object sender, EventArgs e)
    {
         this._parent.mytest();         //CALL WHAT YOU WANT
    }
}

Access user control elements from parent

well, here is the problem, you are using multiple instances of same form.
you should rather create a single instance and use it .

public partial class Program: DevExpress.XtraBars.Ribbon.RibbonForm {

UserControl Campus = null;

 public Program()
    {
        InitializeComponent();
         Campus  = new WindowsFormsApplication1.Campus();
    }

 private void Program_Load(object sender, EventArgs e) {
  // remove this object creation
 //var Campus = new WindowsFormsApplication1.Campus();

        pnlPanel.Panel2.Controls.Add(Campus);
   ... 
}

 public void Reset() {
  // remove this object creation
 //  var Campus = new WindowsFormsApplication1.Campus();
}

private void chkDisplay_EditValueChanged(object sender, EventArgs e) {

 string displayInfo = "";
  // remove this object creation
 // var Campus = new WindowsFormsApplication1.Campus();
}

private void ribbonControl1_MouseDown(object sender, MouseEventArgs e)
    {
     ...
   if(hitInfo.Page.Name == "Campus")
            {
                // remove this object creation
                //var Campus = new WindowsFormsApplication1.Campus();

    }
    ...
}
}

Accessing object in parent user control from child user control

Use the below code to access the hidden field from the child control. this.Parent will give the parent control & use FindControl to find the control by ID.

HiddenField hfID = this.Parent.FindControl("hfId") as HiddenField;
string hiddenvalue = hfID.Value;

If you change the value of the hidden field on page load, then on button click, the updated value gets reflected.

How to Access Parent Window's Control from user control window

I found the answer finally

Window parentWindow = Window.GetWindow(this);

object obj= parentWindow.FindName("Popup1");
System.Windows.Controls.Primitives.Popup pop = (System.Windows.Controls.Primitives.Popup)obj;

pop.IsOpen = false;

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