Question

How I can tell the user by showing a MSG box that what he enterd is not in the right format
I have textbox that i want to get only numbers and if the user entered letters instead to show him a msg

int level;
        if(range.Text.GetType)
        {
            MessageBox.Show("Please Enter Only Number");
        }
        else
        {
        level = int.Parse(range.Text);
        // use the randomGenerator function according to the number i entered.
        TheRandNo = randomGenerator.Next(level);
        //Activate the guess button.
        GuessBT.Enabled = true;
        label4.Text = x.ToString();
        // To start the game with the green color
        BackColor = Color.Green;
        }

thanx in advance

Answer 1

if(!int.TryParse(range.Text, out level))
{
  MessageBox.Show("Please Enter Only Number");
}
else
{
  // No need for your Parse now, level has the right value already
}