C#

private void FrmMain_Shown(object sender, EventArgs e)
    {
    PrintDocument pd = new PrintDocument();
    pd.PrintPage += Pd_PrintPage;
    PrintDialog pdi = new PrintDialog { Document = pd };
    pdi.ShowDialog();
    pd.Print();

private void Pd_PrintPage(object sender, PrintPageEventArgs pe)
        {

            string watermarkText = "Your Name © 2015, All Rights Reserved";
            Font watermarkFont = new Font("Microsoft Sans Serif", 18, FontStyle.Bold);

            int X = 0;
            int Y = 0;

            RectangleF rect2 = panel2.ClientRectangle;

            float image_draw_wd = panel2.Width;

            float image_draw_ht = panel2.Height;

            Brush myBrush = new SolidBrush(Color.FromArgb(128, Color.Blue));

            StringFormat stringFormat = new StringFormat();
            stringFormat.Alignment = StringAlignment.Center;
            stringFormat.FormatFlags = StringFormatFlags.LineLimit;
            stringFormat.Trimming = StringTrimming.Word;


            SizeF sz = pe.Graphics.MeasureString(watermarkText, watermarkFont, (int)image_draw_wd, stringFormat);


            double angle = 0;
            double angleRadians = Math.Atan2(image_draw_ht, image_draw_wd);
            angle = angleRadians * 180.0 / Math.PI;

            pe.Graphics.TranslateTransform((rect2.Location.X + rect2.Width / 2), (rect2.Location.Y + rect2.Height / 2));
            pe.Graphics.RotateTransform((float)angle);// + flip180Image);
            pe.Graphics.TranslateTransform(-(rect2.Location.X + rect2.Width / 2), -(rect2.Location.Y + rect2.Height / 2));


            X = 10;
            X = (int)(panel2.Width - sz.Width) / 2;
            Y = 10;
            Y = (int)(panel2.Height - sz.Height) / 2;

            RectangleF dr_rect = new RectangleF(new Point(X, Y), new Size((int)image_draw_wd, ((int)sz.Height) + 10));

            pe.Graphics.DrawString(watermarkText, watermarkFont, myBrush, dr_rect, stringFormat);
        }

commandText = "SELECT user from UserTable where id = @username"
SqlCommand command = new SqlCommand(commandText, connection);
command.Parameters.AddWithValue("@username", tbUser.Text);

using (SqlConnection con = new SqlConnection(strConnect))
    {
    con.Open();
    using (SqlCommand cmd = new SqlCommand("SELECT Age, Description FROM myTable WHERE ID = @ID", con))
        {
        cmd.Parameters.AddWithValue("@ID", myTextBox.Text);
        using (SqlDataReader reader = cmd.ExecuteReader())
            {
            while (reader.Read())
                {
                int age = (int) reader["Age"];
                string desc = (string) reader["Description"];
                Console.WriteLine($"{age}\n{desc}");
                }
            }
        }
    }

Pete O'Hanlon wrote:

And what happens if the database is not SQL Server? What if the textbox is an ASP.NET Core one? You are making a lot of assumptions with your answer.

using (SqlConnection con = new SqlConnection(strConnect))
using (IDbCommand cmd = con.CreateCommand())
{
   cmd.CommandText = "bla"; 
   con.Open(); // as late as possible

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

using (SqlConnection con = new SqlConnection(strConnect))
    {
    con.Open();
    using (SqlCommand cmd = new SqlCommand("SELECT Age, Description FROM myTable WHERE ID = @ID", con))
        {
        cmd.Parameters.AddWithValue("@ID", myTextBox.Text);
        using (SqlDataReader reader = cmd.ExecuteReader())
            {
            while (reader.Read())
                {
                int age = (int) reader["Age"];
                string desc = (string) reader["Description"];
                Console.WriteLine($"{age}\n{desc}");
                }
            }
        }
    }