Get primary key value of selected row item in DataGrid using WPF

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WPF

SQLite

DataGrid

I have a DataGrid, bound to database table customer.Here is my database query
sqlitecon.Open();
string Query = "Select Card_Number,Clients_Title,Address_Current,Phone_Number,Mobile_Number from Customer_New "; SQLiteCommand createCommand = new SQLiteCommand(Query, sqlitecon); createCommand.ExecuteNonQuery();
SQLiteDataAdapter dataAdp = new SQLiteDataAdapter(createCommand);
DataTable dt = new DataTable("Customer_New");
dataAdp.Fill(dt);
datagrid_cindex.ItemsSource = dt.DefaultView; dataAdp.Update(dt);
sqlitecon.Close();

I need to select the primary key ID value from database table of selected row in DataGrid.

How to do it ? please Help ..