private void btnlogin_Click(object sender, EventArgs e) { conn.Open(); SqlCommand komut = new SqlCommand("select * from tblUser u where u.Admin=@u1 and u.Password=@u2", conn); komut.Parameters.AddWithValue("@u1", txtuser.Text); komut.Parameters.AddWithValue("@u2", txtpswd.Text); SqlDataReader dr = komut.ExecuteReader(); if (dr.Read()) { Homepage hp = new Homepage(); hp.Show(); this.Hide(); } else { MessageBox.Show("Kullanıcı Bulunmamaktadır!!"); } conn.Close(); }