MyControlLibrary.CharTabPage.Char4K2_TextChanged C# (CSharp) Method

        private void Char4K2_TextChanged(object sender, EventArgs e)
        {
            try
            {
                this.Group[3].skill.SetKnowledge2(Convert.ToInt32(Char4K2.Text));
            }//end try
            catch
            {
                if (isError && !Char4K2.Text.Equals(""))
                {
                    ErrorMSG error = new ErrorMSG();
                    //set error message
                    error.ErrorLabel.Text = "Error: This box takes integers only (0-9)";
                    error.Show();
                    isError = false;
                    ///
                    Char4K2.Text = "";
                    ////
                    isError = true;
                }//end if
            }
        }