I have a TextBoxD1.Text and I want to convert it to an int to store it in a database. 
How can I do this?
If you're looking for the long way, just create your one method:
static int convertToInt(string a)
    {
        int x = 0;
        Char[] charArray = a.ToCharArray();
        int j = charArray.Length;
        for (int i = 0; i < charArray.Length; i++)
        {
            j--;
            int s = (int)Math.Pow(10, j);
            x += ((int)Char.GetNumericValue(charArray[i]) * s);
        }
        return x;
    }