validation code in windows form

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C#

I just want to know the code of that will return false like the below code. When value in textbox will be space. And also only alphabets and numbers are allowed neither it will return false. Can i do this in windows form like which i had said? Is there any kind of stuff

private bool ValidateNumbers()
        {
            if (textBox2.Text == string.Empty)
            {
                return true;
            }
            char[] testArr = textBox2.Text.ToArray();
            bool stat = false;
            for (int i = 0; i < testArr.Length; i++)
            {
                if (!char.IsNumber(testArr[i]))
                {
                    stat = true;
                }
            }
            return stat;
        }

code is correct )