Do you mean
public string ABD(int value)
{
string result = string.Empty;
switch (value)
{
case 1:
result = "Capgemini";
break;
case 2:
result = "IBM";
break;
case 3:
result = "Accenture";
break;
default:
break;
}
return result;
}
?
There are several other ways to implement such method.