ArcEngine中如何选择属性表里的某一列并加到combobox控件中？

我的代码如下。可是却不知道那里错了，希望各位不吝赐教。谢谢了先。。
private void QueryStation_Click(object sender, EventArgs e)
{
int i,j;
string sName = "Station";
//string SName = "站点名称";
IFeatureLayer pFeatureLayer = new FeatureLayerClass();
pFeatureLayer = ChooseObject(ref sName) as IFeatureLayer;//参数必须与ref一起传递
IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;
IQueryFilter pQueryFilter;
pQueryFilter = new QueryFilterClass();
pQueryFilter.WhereClause = "站点名称 like'*'";
IFeatureCursor pFeatureCursor = pFeatureClass.Search(pQueryFilter ,false);
IFeature pFeature = pFeatureCursor.NextFeature();
i = pFeature.Fields.FieldCount;
if (pFeature != null)
{
for(j=0;j<i;j++)
{
string featurename = pFeature.get_Value(j).ToString();
comboBox1.Items.Add(featurename);
}
pFeature = pFeatureCursor.NextFeature();

}

}

if (pFeature != null) //这里不能用if对吧？试试whlie
{
for(j=0;j<i;j++)
{
string featurename = pFeature.get_Value(j).ToString();
comboBox1.Items.Add(featurename);
}
pFeature = pFeatureCursor.NextFeature();

}

//还有点疑问，pFeature.get_Value(j).ToString()=null的时候，pFeature应该不为空的，不过你可以测试下。