C#

public string feedJScriptXML()
{
//I know this example method is pointless, but it is just an example. The actual program sends XML it builds from other values
XmlDocument myXMLDoc = new XmlDocument();
myXMLDoc.Load("C:\myXMLfile.xml");
return myXMLDoc.OuterXml;
}

function readCsharpXML()
{
var xmlString = window.external.feedJScriptXML();
var theXML = new ActiveXObject("Microsoft.XMLDOM");
theXML.load(xmlString);
}

private void btnCancel_Click(object sender, EventArgs e)
{
    this.Close();
    this.Dispose();
}

OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=W:\CS Call Info\MobEmail.mdb");
OleDbCommand cmd;

private void btnLogon_Click(object sender, EventArgs e)
{
    //Connection Code
    string sql = "SELECT UserName,Password FROM Users WHERE UserName = '"
        + txtboxUserName.Text + "' AND Password = '" + txtboxPassword.Text + "'";
    OleDbCommand cmd = new OleDbCommand(sql, conn);
    OleDbDataReader dr = cmd.ExecuteReader();

    try
    {
        //Open the Connection
        conn.Open();
    }
    catch (InvalidOperationException ex)
    {
        MessageBox.Show(ex.Message.ToString());
    }

    try
    {
        //Read Database
        if (dr.Read == false) //This is where the error is
        {
            MessageBox.Show("Invalid Username And Or Password Supplied", "Logon Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

        else
        {
            this.DialogResult = DialogResult.OK;
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message.ToString());
    }
    if (conn.State != ConnectionState.Closed)
    {
        conn.Close();
    }