Dim ... As New 和Dim ... As ..

DIm conn As New MySqlConnection(Common.m_strConn)

直接创建了实例对象,直接用

Dim conn As MySqlCommection()

创建了对象但无法实例化需要

set conn=new MySqlConnection(Common m_strConn)

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转载自www.cnblogs.com/dreamcheng/p/9988178.html