Add Row in Datagrid WPF

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WPF

DataGrid

C#5.0

What is the best way to add a row in Datagrid. I am using

AddClass data = new AddClass(234,"ABC");
            dgtest.Items.Add(data);

Method to add row with data in datagrid. But its not working. When i click on button to add row, it adds row with checkboxes not with the data i added in data variable. Why checkboxes are apearing.

AddClass:

class AddClass
   {
       public int Acol { get; set; }
       public string Bcol { get; set; }

       public AddClass()
       {
       }



       public AddClass(int a, string b)
       {
           this.Acol = a;
           this.Bcol = b;
       }
   }

And Also tell me the best way to get data from each cell of datagrid.