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namespace cscConnector
{
    public class BasicAuthForm : Form, ILoginForm
    {
        private TextBox txtServerUrl;

        public BasicAuthForm(string server, string user, string error)
        {
            BasicAuthForm Form = new BasicAuthForm(server, user, error);

            //Form = new Form();
            Form.Size = new System.Drawing.Size(270, 400);
            Form.Text = "Login";

            txtServerUrl = new TextBox();
            txtServerUrl.Location = new System.Drawing.Point(207, 14);
            txtServerUrl.Size = new System.Drawing.Size(229, 24);
            Form.Controls.Add(txtServerUrl);

            ...

            Form.Show();

        }