有关一段代码的运行先后

[facies_437]

//转到Form界面
1、 IFeatureClass pFC;
2、 CAD123.MyForm myForm = new CAD123.MyForm();
3、 myForm.Show();

4、 pFC = myForm.pFeatureClass;
5、 IFeature pFeature = pFC.CreateFeature();
以上代码为何会先运行第四步再运行第三步的？这些代码都是在自己写的类库里的。
如果先运行第四步的话，那就老是会有个错误：没有对pFC，myForm.pFeatureClass中pFeatureClass是myForm自己写的一个属性。请各位教教我怎么可以先运行第三步再运行第四步吧。感激不尽。

[小笨和漂向北方]

Assume pFeatureClass is a property u defined in CAD123.MyForm, then do u instantiate this property in the MyForm's constructor?
If yes, u don't have to run line 3 before line 4. Otherwise, try to find the location this property is initialized.

[numbo]

应该是这样的
1、 IFeatureClass pFC;
2、 CAD123.MyForm myForm = new CAD123.MyForm();
3、 if（myForm.ShowDialog() == DialogResult.OK)
{
4、 pFC = myForm.pFeatureClass;
5、 IFeature pFeature = pFC.CreateFeature()
}