ASP.NET

foreach (GridViewRow row in GridView1.Rows)
    {
        // Selects the text from the TextBox

        // which is inside the GridView control

        string textBoxText = _
          ((TextBox)row.FindControl("TextBox1")).Text;
        Response.Write(textBoxText);
        // Selects the text from the DropDownList

        // which is inside the GridView control

        string dropDownListText = ((DropDownList)
           row.FindControl("DropDownList1")).SelectedItem.Value;
        Response.Write(dropDownListText);
        // Selects items from the ListBox

        // which is inside the GridView control

        ListBox myListBox = (ListBox)row.FindControl("ListBox1");

        foreach(ListItem selectedItem in myListBox.Items)
        {
            // Checks if the item in the ListBox is selected or not

            if (selectedItem.Selected)
            {
                // Print the value of the item if its selected

                Response.Write(selectedItem.Value);
            }
        }
    }

string str = "Hi world, welcome";
foreach (char s in str)
{
  //Calculate the nos of characters here
}

string str="Hello World";
int countW = str.ToCharArray().Count<char>(c => c == 'w');

string hello = "Hello, World!!";

(from fn in
    (from ch in hello.ToCharArray()
     group ch by ch into g
     orderby g.Key
     select new Func<object>(() => {
         Console.WriteLine(g.Key + ": " + g.Count()); return null;
     }))
 select fn()).ToArray();

DateTime.Now.AddHours(5.5).Tostring("dd-mm-yyyy")