private void ExecuteAsync()
{
 IsRunning = true;
 for (int i = 0; i < 1000; i++)
 {
     App.Current.Dispatcher.Invoke(DispatcherPriority.Normal, new Action(
 () => TheTextCollection.Add(string.Concat(string.Format("{0}

public class Student : INotifyPropertyChanged
{       
        const int MINIMUM_AGE = 1;
        int rollNumber = 0;

try
            {
                ushort num;
                int counter=-1;
                string line = "1 12 15 12 8 21";
                string[] str = line.Split(' ');
                ushort[] Numbers = new ushort[str.Length];
                foreach(string piece in str)
                {
                    counter++;

da.Fill(ds,"Employee")

listCol.DataPropertyName = "CategoryId"; 
                listCol.DataSource = ds.Tables["Category"]; 
                listCol.DisplayMember = "CategoryName"; 
                listCol.ValueMember = "CategoryId";