The variable's value is constant at this use. Consider changing this use to a constant.

Remarks

Constants are similar to variables, except that you are not allowed to assign new values to them. If you do not need to modify or assign a value to a variable, consider changing it to a constant. Using constants for values that do not change in code makes your code easier to understand and maintain.

Note that this rule is flagged when a specific use of the variable always has the same value. It does not necessarily mean that you can simply change the variable to a constant. In this case, you may want to create a new constant for this use.

In the following example, the variable pi should be a constant, since it is not modified in code:

    ' VB
    Function CalcArea(ByVal radius As Double) As Double
        Dim pi As Double = 3.14159
        Return pi * radius * radius
    End Function

    // C#
    static double CalcArea(double radius)
    {
        double pi = 3.14159; 
        return pi * radius * radius; 
    }

Resolution

Review variables with values that are not modified in code, and consider changing them to constants. For instance, you could modify the example above to:

    ' VB
    Function CalcArea(ByVal radius As Double) As Double
        Const pi As Double = 3.14159
        Return pi * radius * radius
    End Function

    // C#
    static double CalcArea(double radius)
    {
        const double pi = 3.14159; 
        return pi * radius * radius; 
    }

See Also

Constants Overview (VB)

Constants Overview (C#)