.method private hidebysig instance void
          '获取序列号'() cil managed
  {
    // Code size       58 (0x3a)
    .maxstack  3
    .locals init (class EMSWEB_Send.computer V_0)
    IL_0000:  newobj     instance void EMSWEB_Send.computer::.ctor()
    IL_0005:  stloc.0
    IL_0006:  ldarg.0
    IL_0007:  ldfld      class [System.Windows.Forms]System.Windows.Forms.TextBox EMSWEB_Send.reg::textBox1
    IL_000c:  ldloc.0
    IL_000d:  callvirt   instance string EMSWEB_Send.computer::'机器序列号'()
    IL_0012:  ldstr      "S"
    IL_0017:  call       string [mscorlib]System.String::Concat(string,
                                                                string)
    IL_001c:  callvirt   instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Text(string)
    IL_0021:  ldarg.0

//=================================
运行到 IL_0021 时出现线程访问错误，说'textBox1' 被多个线程访问了，
晕，怎么会出现这种情况，请高人指点下，谢谢

An unhandled exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll

Additional information: Cross-thread operation not valid: Control 'textBox1' accessed from a thread other than the thread it was created on.

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