C#

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

namespace YOURNAMESPACE
{
    public static class ControlMovableExtensions
    {
        private static Control currentControl = null;

        private static Control currentContainer= null;

        private static List<Control> MovableControls = new List<Control>();

        private static Rectangle ClippingRect;

        private static Rectangle ContainerRect;

        private static Point lastGoodLocation;

        private static Point nextLocation;

        private static int mdx, mdy;

        private static bool IsMouseUp = true;

        // experiment with these settings
        private static bool UseClipping = false;
        private static bool UseCapture = false;

        public static void SetMovable(this Control control)
        {
            if (MovableControls.Contains(control))
            {
                throw new ArgumentException("control already movable");
            }

            MovableControls.Add(control);

            control.MouseDown += ControlOnMouseDown;
            control.MouseUp += ControlOnMouseUp;
        }

        public static void RemoveMovable(this Control control)
        {
            if (! MovableControls.Contains(control))
            {
                throw new ArgumentException("control is not movable");
            }

            control.MouseDown -= ControlOnMouseDown;
            control.MouseUp -= ControlOnMouseUp;
        }

        private static void ControlOnMouseMove(object sender, MouseEventArgs e)
        {
            if (IsMouseUp) return;

            nextLocation =  new Point(currentControl.Left + e.X - mdx, currentControl.Top + e.Y - mdy);

            if (ContainerRect.Contains(new Rectangle(nextLocation, currentControl.Size)))
            {
                lastGoodLocation = nextLocation;
            }

            currentControl.Location = lastGoodLocation;
        }

        private static void ControlOnMouseUp(object sender, MouseEventArgs e)
        {
            IsMouseUp = true;

            currentControl.MouseMove -= ControlOnMouseMove;

            if (UseClipping) Cursor.Clip = Rectangle.Empty;

            if (UseCapture) currentControl.Capture = false;

            currentControl = null;
        }

        private static void ControlOnMouseDown(object sender, MouseEventArgs e)
        {
            currentControl = sender as Control;

            if (currentControl == null)
            {
                throw new ArgumentException("control is null");
            }

            currentContainer = currentControl.Parent;

            ContainerRect = currentContainer.ClientRectangle;

            lastGoodLocation = currentControl.Location;

            mdx = e.X;
            mdy = e.Y;

            if (UseClipping)
            {
                ClippingRect = currentContainer.RectangleToScreen(currentContainer.ClientRectangle);
                Cursor.Clip = ClippingRect;
            }

            if (UseCapture) currentControl.Capture  = true;

            currentControl.MouseMove += ControlOnMouseMove;

            IsMouseUp = false;
        }
    }
}

pr1mem0ver wrote:

he is probably saying that his editbox doesn't catch the backspace button

if (e.KeyChar == Convert.ToChar(8))

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

Bayram Demirci wrote:

This is best what I can do.

namespace CustomControls
{
    public enum NumModel
    {
        /// <summary>
        /// 
        /// </summary>
        PositiveInteger,
        /// <summary>
        /// 
        /// </summary>
        PositiveFloat
    }
    public class NumberTextBox : TextBox
    {
        private NumModel numModel = NumModel.PositiveInteger;
        /// <summary>
        /// 
        /// </summary>
        public NumModel NumModel
        {
            get
            {
                return numModel;
            }
            set
            {
                numModel = value;
            }
        }

        protected override void OnKeyPress(KeyPressEventArgs e)
        {
            if ((e.KeyChar >= '0' && e.KeyChar <= '9') || (e.KeyChar == 8) || (e.KeyChar == 46))
            {
                if (numModel == NumModel.PositiveInteger)
                {
                    if ((e.KeyChar == 46))
                    {
                        e.Handled = true;
                    }
                    else
                    {
                        e.Handled = false;
                        //base.OnKeyPress(e);
                    }
                }
                else
                {
                    if ((this.Text.Contains(".") && (e.KeyChar == 46)))
                    {
                        e.Handled = true;
                    }
                    else
                    {
                        e.Handled = false;
                        // base.OnKeyPress(e);
                    }
                }
            }
            else
            {

                e.Handled = true;
            }
        }
        protected override void OnKeyUp(KeyEventArgs e)
        {
            double num;
            if (this.Text != null && this.Text != "" && !double.TryParse(this.Text, out num))
            {
                //SendKeys.Send("{Backspace}");
                this.Text = this.Text.Substring(0, this.Text.Length - 1);
                this.Select(this.Text.Length, 0);
            }
            base.OnKeyUp(e);
        }
    }
}

class MyClass
   {
   public int Value {get; set;}
   public MyClass(int x) { Value = x;}
   }
MyClass[] data = new MyClass[2];
MyClass x = new MyClass(333);
MyClass y = new MyClass(666);
myClass z = new MyClass(999);
myClass[0] = x;
myClass[1] = y;
myClass[0] = z;
myClass[1].Value = 111;

this.CurrentUser.Companies[idx] = comp;

this.CurrentUser.Companies[idx].BusinessName = comp.BusinessName;