There is already an open DataReader associated with this Connection which must be closed first
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这个问题主要是因为在动态绑定时，没有关闭数据库连接引起的，我是这么解决问题的，在
protected void gdvQuery_RowDataBound(object sender, GridViewRowEventArgs e)
{
}中，通过遍历已经绑定的gridview 取值来进一步绑定gridview中需要绑定的控件。如：DropDownList...
- There is already an open DataReader associated with this Connection which must be closed first
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