Customcontrol's backcolor issue

Question

I have a customtextbox with the following declaration .

 public customtextbox()
        {
             this.BorderStyle = BorderStyle.None;
             InitializeComponent();
        }
        protected override void OnEnter(EventArgs e)
        {
            base.OnEnter(e);
            this.BackColor = Color.Black;
            this.ForeColor = Color.White;
            // this.Select(0, 0);// code for dont selecting text 
        }

        protected override void OnLeave(EventArgs e)
        {
            base.OnLeave(e);
           // this.BackColor = change according to the color of the form  
            this.ForeColor = Color.Black;
        }

i am trying to guess how to set the backcolor of this textbox according to the form containing it . Thanks in advance

Answer 1

Hi @rahul kumar , Welcome to Microsoft Q&A.

Do you mean that when the custom textbox control is dragged into the form, its background is automatically modified as the form background?

You can modify in onparentchange event.

Here I set the border to 3D, just for the convenience of display, modify it according to your own needs.

using System;
using System.Windows.Forms;

namespace _6_xx_uc2
{
    public partial class CustomTextBox : TextBox
    {
        public CustomTextBox()
        {
            this.BorderStyle = BorderStyle.Fixed3D;
            InitializeComponent();
        }

        protected override void OnPaint(PaintEventArgs pe)
        {
            base.OnPaint(pe);
        }

        protected override void OnParentChanged(EventArgs e)
        {
            base.OnParentChanged(e);

            if (this.Parent != null)
            {
                this.BackColor = this.Parent.BackColor;
            }
        }
    }
}

Best Regards,

Jiale

---

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". 

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 2

If the Form is the direct parent, you can do :

 this.BackColor = this.Parent.BackColor;