var list = new List<string>() { // Assume some items in the list };

for (var i = 0; i < list.Count; i++)
{
    var item = list[i];
    list.Remove(item);
    
    i--;
}

namespace network
{
    class ip
    {
        uint _IP;
        public ushort this[int i]
        {
            get
            {
                switch(i)
                {
                    case 0:
                    case 1:
                    case 2:
                    case 3:
                        return (ushort)(_IP>>(i*8));
                    default:
                    throw new IndexOutOfRangeException();
                }
            }
            set
            {
                switch(i)
                {
                    case 0:
                    case 1:
                    case 2:
                    case 3:
                        _IP=(((uint)value)<<i*8);
                        break;
                    default:
                    throw new IndexOutOfRangeException();
                }
            }
        }
    }
}

/// <summary>
/// Returns true if any component of of Vector3 v is negative
/// </summary>
public static bool Ext_IsNegative(this Vector3 v)
{
    return v.x < 0f && v.y < 0f && v.z < 0f;
}

private readonly FooType _foo = new FooType();

/// <summary>
/// Gets the controller of this component
/// </summary>
private FooType Foo
{
    get
    {
        return _foo;
    }
}

// IsFooBar being a boolean, we check if it's different from true and from false
if (x.IsFooBar != true && x.IsFooBar != false)
{
    return "error";
}

 if (!String.IsNullOrEmpty(Client.CLADDR1))
            {
                if (Client.CLADDR1 == "NULL")
                {

// Return flagged enum with inverted selected flag value
public static TEnum SwapFlag<TEnum>(this TEnum target, TEnum flag) where TEnum : Enum
    {
        if (target.HasFlag(flag)) return (TEnum)(object)((int)(object)target & ~(int)(object)flag);

        return (TEnum)(object)((int)(object)target | (int)(object)flag);
    }

const int ONLY_ONE_ITEM = 1;

if (myList.Count > ONLY_ONE_ITEM)
{
    DoSomething();
}
else
{
    DoSomethingElse();
}

string AllPDF = "";
int CountPDF = 0;
AllPDF = txtInput.Text;
string[] AllPDF2 = AllPDF.Split(';');
List<string> PDF = new List<string>();
PDF.AddRange(AllPDF2);
while (PDF.Count != CountPDF)
{
    File.Delete(AllPDF2[0 + CountPDF] + ".pdf");
	CountPDF++;
}