C#

command.Parameters.Add("@attach", SqlDbType.VarBinary).Value = bytFile;

Parameters.AddWithValue

command.Parameters.AddWithValue("@attach", bytFile);

private void btnGenerate_Click(object sender, EventArgs e)
       {
           //TODO: CLEAR PREVIOUS DRAWN
           panel3.Controls.Clear();

           //set rows and columns
           int rows = Convert.ToInt32(txtRows.Text);
           int columns = Convert.ToInt32(txtColumns.Text);

           PictureBox[,] map = new PictureBox[rows,columns];

           for (int j = 0; j < columns; j++)
           {
               for (int i = 0; i < rows; i++)
               {
                   //show dynamically
                   System.Threading.Thread.Sleep(50);

                   map[i, j] = new PictureBox();

                   map[i, j].Width = 45;
                   map[i, j].Height = 45;
                   map[i, j].BackColor = Color.NavajoWhite;

                   //set first picturebox position
                   if (i == 0 && j == 0)
                   {
                       map[i, j].Location = new Point(100, 100);
                   }


                   map[i, j].Location = new Point(45 * i + 100, 45 * j + 100);
                   map[i, j].BorderStyle = BorderStyle.Fixed3D;

                   //show on the panel
                   panel3.Controls.Add(map[i, j]);



               }
           }

       }

Child3 child3 = new Child3();
Child1 child1 = new Child1();
child3.Child1Button2Clicked += child1.child3_Child1Button2Clicked;
child3.Show();

public void child3_Child1Button2Clicked(object sender, FormsCommunication e)
{
    NumericalUD1.Visible = e.NumericalUDPass;
    textBox1.Text = e.textBoxPass;
    MessageBox.Show("it got fire" + ": " + e.NumericalUDPass.ToString() + ": " + e.textBoxPass.ToString());
 }

public event EventHandler<FormsCommunication> Child1Button2Clicked;

private void Child3Btn1_Click(object sender, EventArgs e)
{
    FormsCommunication formsCommunication = new 
    FormsCommunication("2782",Convert.ToBoolean(false));

    OnChild1Button2Clicked(formsCommunication);

}

protected virtual void OnChild1Button2Clicked(FormsCommunication e)
{
    Child1Button2Clicked?.Invoke(this, e);
}

public FormsCommunication(string textBox, bool NumericalUD)
 {
    textBoxPass = textBox;
    NumericalUDPass = NumericalUD;   
 }

 public string textBoxPass { get; private set; }
 public bool NumericalUDPass { get; private set; }

Properties.Settings.Default.Username= TxtUsername.Text;
Properties.Settings.Default.Password = TxtPassword.Text;
Properties.Settings.Default.Tel = TxtTel.Text;
Properties.Settings.Default.EMail = TxtEMail.Text;
Properties.Settings.Default.Save();

In the English measurement system, 1 yard equals 3 feet and 1 foot equals 12 inches. Use this information to create an application that lets the user convert distances to and from inches, feet, and yards. Use list boxes for the user to select units being converted from and another list box for the user to select units being converted from. 
 
Write your code in the following order
Program must check for correct input into the textbox. Hint: use TryParse.
Check that user has selected a from unit. If not, let user know no unit has been selected.
Check that user has selected a to unit. If user selects the same unit for both from and to, let them know that they need to select a different unit.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Distance_Converter
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void convertButton_Click(object sender, EventArgs e)
        {
            double distanceInput;
            double inches;
            double feet;
            double yards;
            string measurementFrom;

            if (double.TryParse(distanceTextBox.Text, out distanceInput));
            {
                if (fromListBox.SelectedIndex != -1)
                {
                    if (toListBox.SelectedItem = != -1)
                    {
                        

                    }
                }

            }

        }
    }
}