C#

protected override void OnPaint(PaintEventArgs e)
{
	base.OnPaint(e);

	int segments = 10;
	Color start = Color.FromArgb(81, 165, 244);
	Color end = Color.FromArgb(54, 102, 147);
	RectangleF area = ClientRectangle;
	area.Height /= segments;

	float r = start.R, g = start.G, b = start.B;
	float dr = (end.R - r) / (segments - 1), dg = (end.G - g) / (segments - 1), db = (end.B - b) / (segments - 1);

	using (SolidBrush brush = new SolidBrush(start))
	{
		for (int i = 0; i < segments; i++)
		{
			brush.Color = Color.FromArgb((byte)r, (byte)g, (byte)b);
			e.Graphics.FillRectangle(brush, area);
			area.Y += area.Height;
			r += dr;
			g += dg;
			b += db;
		}
	}
}

allan.gagnon wrote:

I want to make a Login class that I pass info from a text box in to a set variable in the class and then use a get variable to test if my login was successfull. Is this possible?

class MyClass
{
    private string someField; // AKA: member variable
 
    public string SomeProperty
    {
        get
        {
            return this.someField;
        }
        set
        {
            this.someField = value;
        }
    }
}

class Login
{
    private bool isLoggedIn;
 
    public void AuthenticateUser(string userName, string password)
    {
        // Do what you need to do to authenticate the user
    }
 
    public bool IsLoggedIn
    {
        // A getter only because we don't want the outside world to
        // be able to set IsLoggedIn.
        get
        {
            return this.isLoggedIn;
        }
    }
}

allan.gagnon wrote:

However I am getting this error message when I build my project:

Error 1 Property or indexer 'System.Data.Common.DbDataReader.this[string]' cannot be assigned to -- it is read only C:\Documents and Settings\admin\My Documents\Visual Studio 2005\Projects\GasCabinetSimulator\GasCabinetSimulator\ClassLogin.cs 46 37 GasCabinetSimulator

This line is the error: rdr["IsLoggedIn"] = true;

UPDATE tblLogin SET IsLoggedIn = 1 WHERE UserID = ????

SELECT COUNT(*) FROM tblLogin WHERE UserID = @userID AND Password = @password

SqlCommand cmd = new SqlCommand();
cmd.CommandText = "SELECT COUNT(*) FROM tblLogin "+
                  "WHERE UserID = @userID AND Password = @password";
cmd.Connection = cn;
cmd.Parameters.Add("@userId", theUserId);
cmd.Parameters.Add("@password", thePassword);
int matches = (int)cmd.ExecuteScalar();
if (matches == 0)
{
    // No match - user is not logged in
}
else
{
   // A match has been found - user can be logged in.
}