clientdataset怎么用？

ClientDataSet1CDSDesigner: TStringField;
      ClientDataSet1CDSDesigner2: TStringField;
      ClientDataSet1CDSDesigner4: TStringField;
      ClientDataSet1CDSDesigner5: TStringField;
      ClientDataSet1CDSDesigner6: TStringField;
      ClientDataSet1CDSDesigner9: TStringField;
这些定义是什么意思？
为什么我运行程序以后出现doesnot have correspont component
本人新手，望大吓指点！
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