Display 2d array in DataGrid

See my answer in this question. This will also enable editing of the values. Since you're just interested in displaying them it might be easier to use the answer from Jobi Joy if using the DataGrid isn't a requirement.

To make a short version of the answer from that question. You'll need a Ref class

public class Ref<T>
{  
    private readonly Func<T> getter;   
    private readonly Action<T> setter;  
    public Ref(Func<T> getter, Action<T> setter)   
    {   
        this.getter = getter;   
        this.setter = setter;   
    }  
    public T Value { get { return getter(); } set { setter(value); } }   
}  

And a helper class to get dynamic columns from the 2d array

public class BindingHelper
{
    public DataView GetBindable2DViewFromIList<T>(IList list2d)
    {
        DataTable dataTable = new DataTable();
        for (int i = 0; i < ((IList)list2d[0]).Count; i++)
        {
            dataTable.Columns.Add(i.ToString(), typeof(Ref<T>));
        }
        for (int i = 0; i < list2d.Count; i++)
        {
            DataRow dataRow = dataTable.NewRow();
            dataTable.Rows.Add(dataRow);
        }
        DataView dataView = new DataView(dataTable);
        for (int i = 0; i < list2d.Count; i++)
        {
            for (int j = 0; j < ((IList)list2d[i]).Count; j++)
            {
                int a = i;
                int b = j;
                Ref<T> refT = new Ref<T>(() => (list2d[a] as IList<T>)[b], z => { (list2d[a] as IList<T>)[b] = z; });                    
                dataView[i][j] = refT;
            }
        }
        return dataView;
    }
}

After that you can use ItemsSource like this

<DataGrid Name="dataGrid" 
          RowHeaderWidth="0" 
          ColumnHeaderHeight="0" 
          AutoGenerateColumns="True" 
          AutoGeneratingColumn="dataGrid_AutoGeneratingColumn"/> 

dataGrid.ItemsSource = BindingHelper.GetBindable2DViewFromIList<object>(m_2DArray);

private void dataGrid_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e) 
{ 
    DataGridTextColumn column = e.Column as DataGridTextColumn; 
    Binding binding = column.Binding as Binding; 
    binding.Path = new PropertyPath(binding.Path.Path + ".Value");
}