Here enumerated types are: string - & gt; Int. String - & gt; Double; Double - & gt; String code below

 string int_string="123456"; 
String double_string="3.1415926"; 
Double Double_number=3.1415926; 


Int number1. 
Double number2. 
String number3. 

Number1=the Convert. ToInt32 (int_string); 
Number2.=the Convert ToDouble (double_string); 
Number3=Double_number. ToString (); 

Console. WriteLine (" number1: {0} number2: {1} number3: {2} ", number1, number2, number3); 
Console.ReadKey(); 

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Int. J parse
Int. J tryparse