How to call a method of a public class within another class?

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I have a public class Class A() which contains several method.

I have two other classes within which I create the object of Class A to call its method say MethodA().
Now it is behaving very strangely when I call MethodA() from the other two classes it returns same value to both the classes although the input is different from theses classes.

**Note my application is in Multi threaded environment.**

Some illustration of my code is below:

namespace Project1
{
   public Class A : SourceClass
{
    public string MethodA(string input)
{
//it performs a logic and returns string variable
string str1 = input;
string str2 = "Hello";
string str3 = "";
if(str1.Compare(str2))
{
str3 = "Same";
}
else
{
str3 = "Different";
}
return str3;
}
}

public Class B : SourceClass
{
  A objA = new A();
string input1 = "Hello";
string str1 = objA.MethodA(input1);
MessageBox.Show(str1 + "from Class B");
}

public Class C : SourceClass
{
A objA = new A();  
string input1 = "Hi";
string str1 = objA.MethodA(input1);
MessageBox.Show(str1 + "from Class C");
}
}

Now When I run my application I get output as Same from Class B and Same from Class C, whereas I should get Different from Class C.

Since its a Multithreaded Environment I think I am missing to lock an object. Please guide me as to where am I going wrong.

asked 50 secs ago

user2786794

13