variables - How to make a label show a double in vs 2012 c# -

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I'm a response test comes when the green button I have a label, I have to start counting labels In milliseconds I have created a timer and a square so that the code looks like this:

class code: 

  class Class2 {public static int = 1 ; Public Stable Double B = 0.000; }   
 timer code:  
  private void timer 2_Tick (object sender, Iventaarjis e) {WindowsFormsApplication3.Class2.b = WindowsFormsApplication3.Class2.b + 0.001 ; Label 1 Text = convert Toaster (windowsforms3 class 2.b); }   
 but I'm getting an error saying "but the 'string' type from 'double' can not be converted." "How do I stop this error?"  
 some people have said here you have it: code:  
  {public form 1 () {Arnbhiksmuh ();} private void timer 1 volt (object sender, Iventargs e ) {WindowsFormsApplication3.Class2.a = WindowsFormsApplication3.Class2.a + 1; if (WindowsFormsApplication3.Class2.a == 8) {button1.Visible = false; button 2. qualified = true; Timer2.Enabled = true;} {} } not Iji zero timer 2_Tick (object sender, Iventarj e) {WindowsFormsApplication3.Class2.b = WindowsFormsApplication3.Class2.b + 001; Label1.Text = WindowsFormsApplication3.Class2.b.ToString ();} private void button 3_Click (object sender, EventArgs e) {button3.Visible = false; button 1. valid = true; Timer1.Enabled = true; error:  
 error 1 indirectly 'double' type 'string' line 38 column convert 27 Can not be done   
 P>  
 
 
 Double. Use the toasting () method  
  label1.Text = WindowsFormsApplication3 .class2.b.ToString ();

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