How to get column value from the selected row in data grid in wpf c#.net

Data grid is a control for display the data in tabular format in our application. In data grid when u select any row then for getting this rows unique id write code like :

Ex : here we will take ‘dgcustomer’ as data grid with following column name (Id,Name,RollNumber,Pass)

                       

string strid = "";

                        DataRowView rowview = dgcustomer.SelectedItem as DataRowView;

              strid = rowview.Row["Id"].ToString();

MessageBox.Show("ID : " + strid);