Ошибки компиляции MyDataAdapter

Может, что в using добавить надо?

Ошибки при комияции:

Error 1 The name 'MyDataAdapter' does not exist in the current context e:\all\a\b\Form1.cs

Error 2 The name 'MyConnectionString' does not exist in the current context e:\all\a\b\Form1.cs

Код:

  BindingSource MyBindingSorce = new BindingSource();
  MyDataAdapter = new SqlDataAdapter("SELECT * FROM MyTable", MyConnectionString);
  DataTable MyDataTable = new DataTable();
  MyDataAdapter.Fill(MyDataTable);
  MyBindingSorce.DataSource = MyDataTable;

Код:

SqlCommandBuilder MyCommandBuilder = new SqlCommandBuilder(MyDataAdapter);
            MyDataAdapter.UpdateCommand = MyCommandBuilder.GetUpdateCommand(true);