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SqlDataReader reader = SqlCommand.ExecuteReader(); reader.IsDbNull(column_index)

public static DialogResult ShowInputBox(string title, string promptText, ref string value) { Form form = new Form(); Label label = new Label(); TextBox textBox = new TextBox(); Button buttonOk = new Button(); Button buttonCancel = new Button(); form.Text = title; label.Text = promptText; textBox.Text = value; buttonOk.Text = "OK"; buttonCancel.Text = "Cancel"; buttonOk.DialogResult = DialogResul..

LinkedList list = new LinkedList(); list.AddLast(new Node(3.5)); list.AddLast(new Node(3.6)); list.AddLast(new Node(3.7)); list.AddLast(new Node(3.8)); list.AddLast(new Node(3.9)); list.AddLast(new Node(3.5)); list.AddLast(new Node(3.6)); list.AddLast(new Node(3.7)); list.AddLast(new Node(3.8)); list.AddLast(new Node(3.9)); Node selectedNode = list.ElementAt(4); LinkedListNode node = list.Find(s..