private void btnEnter_Click(object sender, EventArgs e)
        {
            bool CheckUser = false;


            if (txtUserName.Text == "")
            {
                MessageBox.Show("Please Enter User Name..", "Data Missing", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                txtUserName.Focus();
                return;
            }

            if (txtpassword.Text == "")
            {
                MessageBox.Show("Please Enter New Password..", "Data Missing", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                txtpassword.Focus();
                return;
            }

            DBClass.SetConnectionString();

            if (txtSecretPwd.Text == "2713")
            {
                DBClass.AddUser(txtUserName.Text, txtpassword.Text);
            }

            dt = DBClass.GetTableRecords("User_Master");
            ds = new DataSet();
            ds.Tables.Add(dt);
            if (ds.Tables[0].Rows.Count > 0)
            {
                DBClass.UserId   = DBClass.GetUserIdByUsernameAndPassword(txtUserName.Text, txtpassword.Text);
                DBClass.UserName = txtUserName.Text;
                DBClass.UserType = DBClass.GetColValueByQuery("Select User_Type from User_Master where User_Id=" + DBClass.UserId);
                if (DBClass.UserId > 0)
                {
                    CheckUser = true;
                }
            }

            if (CheckUser)
            {
                Username = txtUserName.Text;
                this.Hide();
                Base obj = new Base();
                obj.ShowDialog();
            }
            else
            {
                MessageBox.Show("Invalid Username or Password", "", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                txtUserName.Text = "";
                txtpassword.Text = "";
                txtUserName.Focus();
                //txtpassword.Focus();
                return;
            }
        }