multiple conditions in switch C#

Question

Unable to add multiple conditions in switch statement. How to do this using a switch statement? do i have to use multiple if conditions?

string oldValue = ".....long string1....";
string newValue = ".....long string2....";
switch (oldValue.Length && newValue.Length)
{
    case <500 && <500:
        //insert as is
        break;
    case >500 && <500:
        //split oldValue into array of strings and insert each
        //insert newValue as is
        break;
    case <500 && >500:
        //insert oldValue As is
        //split newValue into array of strings and insert each
        break;
    case >500 && >500:
        //split oldValue into array of strings and insert each
        //split newValue into array of strings and insert each
        break;
    default:
        break;
}

Answer 1

No, you can't do this. switch statements test against values, not expressions.

You need to use if statements instead.

Answer 2

Looking at your comments, the length of oldValue only affects what you do with oldValue, and the length of newValue only affects what you do with newValue.

Why not split this into two separate statements? Or even into a common method?

string[] GetValuesToInsert(String input)
{
    if (input.Length < 500)
        return new[] {input};
    else
        return input.Split(...);
}

whatever.Insert(GetValuesToInsert(oldValue));
whatever.Insert(GetValuesToInsert(newValue));