wpf Application

Question

Hello,

I am developing one small application in that i want to drag one button1 and drop into button2

but my problem is button2 should not accept any other button apart from button1.

I am new to this .

Here is my code: 

 

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace DragDrop

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

const byte CtrlMask = 8;

private void sourceButton_MouseDown(object sender, MouseEventArgs e)

{

// sourceButton.DoDragDrop(sourceButton.Text, DragDropEffects.Copy);

if (e.Button == MouseButtons.Left)

{

sourceButton.Select();

sourceButton.DoDragDrop(sourceButton.Text, DragDropEffects.Move | DragDropEffects.Copy);

}

}

private void targetButton_DragEnter(object sender, DragEventArgs e)

{

if (e.Data.GetDataPresent(DataFormats.Text))

{

if ((e.KeyState & CtrlMask) == CtrlMask)

e.Effect = DragDropEffects.Copy;

else

e.Effect = DragDropEffects.Move;

}

else

{

e.Effect = DragDropEffects.None;

}

}

private void targetButton_DragDrop(object sender, DragEventArgs e)

{

Button btn = sender as Button;

if (btn == targetButton )

{

targetButton.Text = e.Data.GetData(DataFormats.Text).ToString();

}

else

{

}

}

private void sourceButton1_MouseDown(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

sourceButton1.Select();

sourceButton1.DoDragDrop(sourceButton1.Text, DragDropEffects.Move | DragDropEffects.Copy);

}

}

private void targetButton1_DragEnter(object sender, DragEventArgs e)

{

if (e.Data.GetDataPresent(DataFormats.Text))

{

if ((e.KeyState & CtrlMask) == CtrlMask)

e.Effect = DragDropEffects.Copy;

else

e.Effect = DragDropEffects.Move;

}

else

{

e.Effect = DragDropEffects.None;

}

}

private void targetButton1_DragDrop(object sender, DragEventArgs e)

{

Button btn = sender as Button;

if (btn == targetButton1 )

{

targetButton1.Text = e.Data.GetData(DataFormats.Text).ToString();

}

else

{

}

}

}

}