str = dtcmbMajor.Text
dtMain.RecordSource = "select class from class where class.major_ID = (select top 1 major_ID from major where major_name='" + str + "')"
dtMain.Refresh
dtcmbClass.ListField = "class"
dtcmbClass.Refresh
dtMain.RecordSource = "select class from class where class.major_ID = (select top 1 major_ID from major where major_name='" + str + "')"
dtMain.Refresh
dtcmbClass.ListField = "class"
dtcmbClass.Refresh
解决方案 »
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