wpf button animation problem

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WPF

i am trying to make a small application i am new to wpf what i am trying is i have seven buttons named as {button 1, button2 and so on} of different colors

theirs an method which generates random number {1,2,3,4} or {1,2} or someother combination

so if random numbers which are generated are {1,2} so button one should show animation and then after 2 seconds button 2 should should show animation

but the problem which i am facing is both the buttons are showing animation at same time

can anyone tell me how do i resolve it it will be very kind

this is the code

public delegate void AddOperationDelegate();
public partial class MainWindow : Window
{
private void InvokeMessage(IAsyncResult ar)
{
AddOperationDelegate aod = (ar as AsyncResult).AsyncDelegate as AddOperationDelegate;
aod.EndInvoke(ar);

}
DispatcherTimer dispatcherTimer = new DispatcherTimer();
List<list><int>> fnlst = new List<list><int>>();
List<int> gmequestion = new List<int>();
List<int> gmeanswer = new List<int>();

List<list><int>> chklist = new List<list><int>>();
public MainWindow()
{
dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
dispatcherTimer.Interval = new TimeSpan(0, 0, 0);
dispatcherTimer.Start();
}

private void dispatcherTimer_Tick(object sender, EventArgs e)
{

GenreateNumbers();

}
public void GenreateNumbers()
{

List<int> ldata = new List<int>();
Random r = new Random();
int va = r.Next(1, 7);
int a1 = va / 10;
int b = va % 10;
if (a1==0)
{
a1 = a1 + 1;
}
Random rnd = new Random();
var randomNumbers = Enumerable.Range(a1, b).OrderBy(i => rnd.Next()).ToArray();
randomNumbers = (from i in randomNumbers.ToArray()
orderby i ascending
select i).ToArray();
List<int> c = new List<int>();
foreach (var item in randomNumbers)
{
if (item==1)
{
DoubleAnimation a = new DoubleAnimation();
a.From = 50;
a.To = 100;
// Start animating
a.Duration = new Duration(TimeSpan.Parse("0:0:5"));
button1.BeginAnimation(Button.WidthProperty, a);
//FileInfo f = new FileInfo("..\\..\\Songs\\1.mp3");
//m1.Source = new Uri(f.FullName.ToString());
//m1.Play();

}
else if (item == 2)
{



DoubleAnimation a = new DoubleAnimation();
a.From = 50;
a.To = 100;
// Start animating
a.Duration = new Duration(TimeSpan.Parse("0:0:5"));
button2.BeginAnimation(Button.WidthProperty, a);
//FileInfo f = new FileInfo("..\\..\\Songs\\2.wav");
//m1.Source = new Uri(f.FullName.ToString());
//m1.Play();

}
else if (item == 3)
{
Thread.Sleep(2000);
DoubleAnimation a = new DoubleAnimation();
a.From = 50;
a.To = 100;
// Start animating
a.Duration = new Duration(TimeSpan.Parse("0:0:5"));
button3.BeginAnimation(Button.WidthProperty, a);
//FileInfo f = new FileInfo("..\\..\\Songs\\3.wav");
//m1.Source = new Uri(f.FullName.ToString());
//m1.Play();

}
else if (item == 4)
{
Thread.Sleep(2000);
DoubleAnimation a = new DoubleAnimation();
a.From = 50;
a.To = 100;
// Start animating
a.Duration = new Duration(TimeSpan.Parse("0:0:5"));
button4.BeginAnimation(Button.WidthProperty, a);



}
else if (item == 5)
{
Thread.Sleep(2000);
DoubleAnimation a = new DoubleAnimation();
a.From = 50;
a.To = 100;
a.Duration = new Duration(TimeSpan.Parse("0:0:5"));
button5.BeginAnimation(Button.WidthProperty, a);
}
else if (item == 6)
{
Thread.Sleep(2000);
DoubleAnimation a = new DoubleAnimation();
a.From = 50;
a.To = 100;
// Start animating
a.Duration = new Duration(TimeSpan.Parse("0:0:5"));
button6.BeginAnimation(Button.WidthProperty, a);

}
else if (item == 7)
{
Thread.Sleep(2000);
DoubleAnimation a = new DoubleAnimation();
a.From = 50;
a.To = 100;
// Start animating
a.Duration = new Duration(TimeSpan.Parse("0:0:5"));
button7.BeginAnimation(Button.WidthProperty, a);
}
}
dispatcherTimer.Interval = new TimeSpan(0, 0, 15);



}

private void button1_Click(object sender, RoutedEventArgs e)
{
FileInfo f = new FileInfo("..\\..\\Songs\\1.mp3");
m1.Source = new Uri(f.FullName.ToString());
m1.Play();


}
private void button2_Click(object sender, RoutedEventArgs e)
{
FileInfo f = new FileInfo("..\\..\\Songs\\2.wav");
m1.Source = new Uri(f.FullName.ToString());
m1.Play();
}
private void button3_Click(object sender, RoutedEventArgs e)
{
FileInfo f = new FileInfo("..\\..\\Songs\\3.wav");
m1.Source = new Uri(f.FullName.ToString());
m1.Play();
}


private void button4_Click_1(object sender, RoutedEventArgs e)
{
FileInfo f = new FileInfo("..\\..\\Songs\\4.wav");
m1.Source = new Uri(f.FullName.ToString());
m1.Play();
}

private void button5_Click_1(object sender, RoutedEventArgs e)
{
FileInfo f = new FileInfo("..\\..\\Songs\\5.mp3");
m1.Source = new Uri(f.FullName.ToString());
m1.Play();
}


private void button6_Click(object sender, RoutedEventArgs e)
{
FileInfo f = new FileInfo("..\\..\\Songs\\6.mp3");
m1.Source = new Uri(f.FullName.ToString());
m1.Play();
}


private void button7_Click_1(object sender, RoutedEventArgs e)
{
FileInfo f = new FileInfo("..\\..\\Songs\\7.mp3");
m1.Source = new Uri(f.FullName.ToString());
m1.Play();
}


public class CusComparer : IEqualityComparer<list><int>>
{
public bool Equals(List<int> x, List<int> y)
{
return x.SequenceEqual(y);
}

public int GetHashCode(List<int> obj)
{
int hashCode = 0;

for (var index = 0; index < obj.Count; index++)
{
hashCode ^= new { Index = index, Item = obj[index] }.GetHashCode();
}

return hashCode;
}
}

private void m7_MediaOpened(object sender, RoutedEventArgs e)
{

}

}