[WinForms] Concatenation of a Label and a Variable

Good afternoon,
I have a question, is it possible to Concatenate a variable to a label?

For example, i'm doing:

Random Rnd = new Random();
      int num1 = Rnd.Next(1, 11);

And now i want to concatenate the random number to give test me if the label of that number has a char inside.

if ( lbl_s_num1.Text != "X")

Is this possible?