C#

private void TestButton_Click(object sender, EventArgs e)
    {
        //Random numbers in a MessageBox to test output
        MessageBox.Show("4\n" + ToLiterals("4"));
        MessageBox.Show("57\n" + ToLiterals("57"));
        MessageBox.Show("209\n" + ToLiterals("209"));
        MessageBox.Show("8734\n" + ToLiterals("8734"));
        MessageBox.Show("24567\n" + ToLiterals("24567"));
        MessageBox.Show("973654\n" + ToLiterals("973654"));
        MessageBox.Show("2315736\n" + ToLiterals("2315736"));
        MessageBox.Show("27065154\n" + ToLiterals("27065154"));
        MessageBox.Show("827464876\n" + ToLiterals("827464876"));
        MessageBox.Show("1675376283\n" + ToLiterals("1675376283"));
    }

    private string ToLiterals(string Input)
    {
        String Output = "";
        while (Input.Length > 0)
        {
            if (Input[0] == '0')//Ignore zeros
            {
                Input = Input.Remove(0, 1);
                Output += "And ";
                continue;
            }
            if (Input.Length % 3 != 2)
            {
                // We are at the Xs if our number is XYX,XYX,XYX
                // Either first, or third position in each segment.
                Output += ConvertChar(Input[0].ToString());
                if (Input.Length % 3 == 0 && Input.Length > 2) //third position in a segment
                    Output += "Hundred ";
                else
                    Output += GetSegment(Input.Length / 3); //first position
                    Input = Input.Remove(0, 1);
                continue;
            }
            else
            {
                //We are talking about first and second positions togerther :YXX,YXX,YXX
                if (Input[0] == '1') //Is it Xteen? ie. 11-19
                {
                    Output += ConvertChar(Input.Substring(0, 2));

                }
                else //Or above 19?
                {
                    Output += ConvertChar(Input[0] + "0");
                    Output += ConvertChar(Input[1].ToString());
                }
                Output += GetSegment(Input.Length / 3);
                Input = Input.Remove(0, 2);
            }
        }
        return Output;
    }

    private string GetSegment(int seg)
    {
        switch (seg)
        {
            case 1: { return "Thousand "; }
            case 2: { return "Million "; }
            case 3: { return "Billion "; }
            case 4: { return "Trillion "; }
            default: { return ""; }
                //The list can grow
        }
    }

    private string ConvertChar(string ToConvert)
    {
        switch (ToConvert)
        {
            case "1": { return "One "; }
            case "2": { return "Two "; }
            case "3": { return "Three "; }
            case "4": { return "Four "; }
            case "5": { return "Five "; }
            case "6": { return "Six "; }
            case "7": { return "Seven "; }
            case "8": { return "Eight "; }
            case "9": { return "Nine "; }
            case "10": { return "Ten "; }
            case "11": { return "Eleven "; }
            case "12": { return "Twelve "; }
            case "13": { return "Thirteen "; }
            case "14": { return "Fourteen "; }
            case "15": { return "Fifteen "; }
            case "16": { return "Sixteen "; }
            case "17": { return "Seventeen "; }
            case "18": { return "Eighteen "; }
            case "19": { return "Nineteen "; }
            case "20": { return "Twenty "; }
            case "30": { return "Thirty "; }
            case "40": { return "Fourty "; }
            case "50": { return "Fifty "; }
            case "60": { return "Sixty "; }
            case "70": { return "Seventy "; }
            case "80": { return "Eighty "; }
            case "90": { return "Ninety "; }
            default: { return ""; }
        }
    }

Regards

<br />
<br />
string sSelectedFile = null;<br />
if (fileDialog.Show(this) == DialogResult.OK)<br />
    sSelectedFile = fileDialog.Filename;<br />
<br />

System.IO.FileInfo youreFile = new System.IO.FileInfo("filename");<br />
if((youreFile.Attributes &  System.IO.FileAttributes.ReadOnly) != System.IO.FileAttributes.ReadOnly)<br />
{<br />
    //I think the Attribute is set, when the File is in use.<br />
}