主题：[求助]怎样从后获取用户名

各位老师，我想从后台抓取角色是“经理”的用户姓名，写了一下代码，结果报错，如截图，请老师指点

Dim cmd As New SQLCommand

Dim dt As DataTable

cmd.C

cmd.CommandText = "Select * F rom {用户管理} Where [角色] = '经理'"

dt = cmd.ExecuteReader

For Each dr1 As DataRow In dt.DataRows

    Dim  d As  DataRow=dr1

Dim  a As  String=d("姓名")

   MessageBox.show(a) 

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