How can I add a code like "if I type 4, it gives me 4 numbers random, (1485),if I type lets say 6 it then it gives me 6 numbers random (178398)

How can I write a code for this problem? IF I type in the textbox any number, how can I get a random number which its length value is the same number I entered in the textbox? like: if I type 4, label1`d show me 4 numbered random. type in the textbox 4, label lets say 4598,9637 like this