Variables in a loop

You don't want 3 variables with the same name, you want an array of those variables.

string[] messages = new string[3]; // 3 item array

You can then store your items in the array elements

messages[0] = "Apple"; // array index starts at 0!
messages[1] = "Banana";
messages[2] = "Cherry";

Another way to create that array is an inline array initializer, saves some code

string[] messages = { "Apple", "Banana", "Cherry" };

(Note: there are more valid syntaxes for array initialization. Research on the various other methods is left as an exercise.)

And access them via a loop (foreach)

foreach (string fruit in messages)
{
    Console.WriteLine("I'm eating a " + fruit);
}

Or for

for (int i = 0; i < messages.Length; i++)
{
    Console.WriteLine("I'm eating a " + messages[i]); // reading the value
    messages[i] = "blabla" + i.ToString(); // writing a value to the array
}

can you use an array? or list type?

string[] messages = new string[3];
for (int i = 1; i <=3; i++)
 {
   messages[i] = "blabla" + i.ToString();
 }

You said you don't want to have a switch statement. I realize this does have a switch, but if you must have three different variables, you could encapsulate your switch inside a function call:

string message1 = null;
string message2 = null; 
string message3 = null;

void SetMessage(int i, string value)
{
    if(i == 1)
        message1 = value;
    etc
}

 for (int i = 1; i <=3; i++)
 {
   SetMessage(i, "blabla" + i.ToString());
 }

Not an optimal solution but if you MUST have separate variables it will hide the mess.

Variables in a loop

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