If (cbName.Text != String.Empty) AND (cbServer.Text != String.Empty) AND (txtUser.Text != String.Empty) AND (txtPassword.Text != String.Empty)
{
//do something
}
else
{
//do something else
}

public class GlobalVariables
{
    private string clienttype;
    private string servername;
    private string username;
    private string password;
    private string filename = @"C:\Program Files\Picture Capture\Settings.txt";

try
{
     while(true)
     {
          Temp.Add(reader.ReadLine());
     }
}

    public void GetSettings()
    {
        string filename = @"C:\Program Files\Picture Capture\Settings.txt";
        if (File.Exists(filename))
        {
            System.IO.StreamReader

public static System.Drawing.Image DIB_ToImage(System.IntPtr hdib)

string filename = @"C:\Program Files\Picture Capture\Settings.txt";
        if (File.Exists(filename))
        {
            StreamReader reader = new StreamReader(filename);

                        byte[] getimage = (byte[])cmd.ExecuteScalar();
                        string strfn = Convert.ToString(DateTime.Now.ToFileTime());
                        FileStream fs = new FileStream(strfn,
                                          FileMode.CreateNew, FileAccess.Write);
                        fs.Write(getimage, 0, getimage.Length);

private void btnSearch_Click(object sender, EventArgs e)
        {
            SearchFunctions sf = new SearchFunctions(txtPracCode.Text,txtMRN.Text, txtFName.Text, txtLName.Text, txtDOB.Text, txtSSN.Text, 0);
            long PersonID = Convert.ToInt32(sf.PersonSearch());
            if (PersonID != 0)