C#

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

namespace CSApplication1 {
	public partial class Form1 : Form {
		public VBForm1 vbf;
		public Form1() {
			InitializeComponent();
			vbf = new VBForm1();
			vbf.Show();
		}

		private void button1_Click(object sender, EventArgs e) {
			vbf.Label1.Text = "Hello World!";
		}
	}
}

ProjectVB.Form1 f1 = new ProjectVB.Form1;
f1.ShowDialog();
f1.ChangeLblFunction();

ProjectVB.Form1 f1 = new ProjectVB.Form1;
f1.Show();

public partial class MyForm
{
    private VBFormProject.VBForm m_vbForm = null;

    private void clickHandler(object sender, EventArgs e)
    {
        if (m_vbForm == null)
        {
            m_vbForm = new VBFormProject.VBForm();
        }
        // call show to make the form modeless
        m_vbForm.Show();
        m_vbForm.Fnc_ChangeText("some text");
    }

    private void OnClosing()
    {
        if (m_vbForm != null)
        {
            m_vbForm.Close();
        }
    }
}

dataGridView1.Font = new Font(FontFamily.GenericSansSerif, 10, FontStyle.Regular);

//First get the array of FontFamilies
FontFamily[] ff = System.Drawing.FontFamily.Families;

//Next loop through the font families to find Verdana
FontFamily myFF = null;
foreach (FontFamily f in ff) {
	if (f.Name == "Verdana") {
		myFF = f;
		break;

	}
}

//Now set your DataGridView's Font:
dataGridView1.Font = new Font(myFF, 10, FontStyle.Regular);

string cString = Convert.ToInt32(c).ToString();

double a = 123456.789;
double b = 7;
double c = Math.Floor(a/b);

BDJones wrote:

Do I really have to go get the state from the checkbox

BDJones wrote:

if (checkBox1 == true) ...

private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
   CheckBox chkBox = (CheckBox)sender;
   if(chkBox.Checked) ...
}