Can you convert NVarChar into a string?

SampleDataAccess.cs

var r = new DataSet();

try
{
	var connectionString = "database-connection-string";
	using (DbConnection connection = new SqlConnection(connectionString: connectionString))
	{
		connection.Open();
		using (DbCommand command = connection.CreateCommand())
		{
			command.CommandText = "Select [F].[Foo] FROM [dbo].[Foos] [F] WHERE [F].[ID] = @ID"; // [F].[Foo] is a NVarChar column in this example

			command.Parameters.Add(new SqlParameter { ParameterName = "ID", DbType = DbType.Int32, Value = 1 }); // Always use parameters to protect yourself from SQL injecteion

			var dataAdapter = new DbDataAdapter();
			dataAdapter.SelectCommand = command;
			dataAdapter.Fill(r);
		}
	}
}
catch (Exception exception)
{
	throw exception;
}

string value = r.Tables[0].Rows[0]["Foo"] // will return a string value.