vb.net kil掉SQL数据库进程不生效

Dim strConnection As String = "data source=WIN-8J5UO9K1ULN; initial catalog=master;integrated security=SSPI"
        Dim sqlConnection1 As New SqlConnection(strConnection)
        Dim dataAdapter As New SqlDataAdapter
        Dim dst As New DataSet
        Dim dt As New DataTable
        sqlConnection1.Open()   '打开数据库
        Dim sql As String = "select spid from sysprocesses where dbid=db_id('财务管理数据库') "
        Dim cmd As SqlCommand = New SqlCommand(sql, sqlConnection1)
        dataAdapter.SelectCommand = cmd
        dataAdapter.Fill(dst, "sysprocesses")
        dt = dst.Tables("sysprocesses")
        sqlConnection1.Close()   '关闭数据库
        DataGridView1.AutoGenerateColumns = True '自动创建列
        DataGridView1.DataSource = dt
        Try
            cn = New SqlConnection("data source=WIN-8J5UO9K1ULN; initial catalog=master;integrated security=SSPI")
            cn.Open()
            If DataGridView1.RowCount > 1 Then
                For b = 0 To DataGridView1.RowCount - 1
                    a = DataGridView1.Rows(b).Cells(0).Value.ToString()
                    cm = New SqlCommand("kilL '" + a + "'", cn)
                    MsgBox(a)
                    MsgBox(DataGridView1.RowCount)
                Next

                cm.ExecuteNonQuery()

                cn.Close()
            End If
        Catch ex As Exception
        End Try
        Try
            cn = New SqlConnection("data source=WIN-8J5UO9K1ULN; initial catalog=master;integrated security=SSPI")
            cn.Open()

            cm = New SqlCommand("DROP DATABASE 财务管理数据库", cn)

            cm.ExecuteNonQuery()

            cn.Close()
        Catch ex As Exception
        End Try

        'Try
        '    cn = New SqlConnection("data source=WIN-8J5UO9K1ULN; initial catalog=master;integrated security=SSPI")
        '    cn.Open()

        '    cm = New SqlCommand("restore database 财务管理数据库 from disk='E:\锱铢财务管理数据库备份文件' with replace ", cn)

        '    cm.ExecuteNonQuery()

        '    cn.Close()
        'Catch ex As Exception
        'End Try

KILL进程部分无效???????????????????????????????????????? vb.net KILL进程 SQL数据库数据备份恢复求教各位大神
快来帮帮忙啊楼主要是改变一下提问的技巧，估计会有大侠出手的.....

补充：VB ,  网络编程