C#

string text = "four score and seven years ago";
Regex rx = new Regex(@"\w+");

string result = rx.Replace(text, match =>
{
    string x = match.Value;
    if (char.IsLower(x[0]))
    {
        x = char.ToUpper(x[0]) + x.Substring(1, x.Length - 1);
    }
    
    return x;
});

Quote:

Object reference not set to an instance of an object.

Quote:

NullReferenceException: Object reference not set to an instance of an object.]
Avenue.Equipment.Invoice.btncontinue_Click(Object sender, EventArgs e) in C:\Users\User\Desktop\TCS - WinHost (NEW GOOD)\Avenue\Equipment\Invoice.aspx.cs:1284

private void Historybutton_Click(object sender, EventArgs e)
        {
            DataTable HFdt = new DataTable();
            DialogResult result3 = openFileDialog2.ShowDialog();

            if (result3 == DialogResult.OK) // Test result.
            {
                String Fname = openFileDialog2.FileName;
                DateTime d = DateTime.Now;
                var format = "yy/MM/dd-HH:mm:ss";
                var fileDates = System.IO.File.ReadAllLines(Fname)
                                .Where(l => l.Length >= format.Length
                                        && DateTime.TryParseExact(l.Substring(0, format.Length)
                                                                , format
                                                                , CultureInfo.InvariantCulture
                                                                , DateTimeStyles.None
                                                                , out d)
                                )
                                .Select(l => d)
                                .OrderBy(dt => dt);
                
                if (fileDates.Any())
                {
                    DatecomboBox.Items.Add(fileDates.First());
                    DatecomboBox.Items.Add(fileDates.Last());
                }
            }
        }

DatecomboBox.Items.Add(fileDates);

String Fname = openFileDialog2.FileName;
            string[] raw_text = System.IO.File.ReadAllLines(Fname);
            var lines = new List<string>();
            foreach (var line in File.ReadLines(Fname))

            {
                
                listBox1.Items.Add(line);
            }

List<DateTime> logDates = new List<DateTime>();
            string dets;

            //Define regex string for date
            string pattern = @"(?<logDate>(\d){2}/(\d){2}/(\d){2})";
            Regex reg = new Regex(pattern);

            
            //read log content
            string logContent = File.ReadAllText(Fname);

            //run regex
            MatchCollection matches = reg.Matches(logContent);


            //iterate over matches
            foreach (Match m in matches)
            {
                DateTime logTime = DateTime.Parse(m.Groups["logDate"].Value);
                logDates.Add(logTime);
                DatecomboBox.Items.Add(logTime);
                object[] distinctItems = (from object o in DatecomboBox.Items select o).Distinct().ToArray();
                DatecomboBox.Items.Clear();
                DatecomboBox.Items.AddRange(distinctItems);
            }