Whay dont you craete a Extension class and provide your functionalitu
like First create a custom static class with your requirements
public static class MyExtensionClass
{
public static string ToCustomString(this int value)
{
return (value > 0 ? "+" + value : value.ToString());
}
}
and than use it like that
int s = 1;
int s1 = -1;
Response.Write(s.ToCustomString());
Response.Write(s1.ToCustomString());
By using this no need to write this conversion logic to every place.