form and enter key on keybord

Question

Hi 
i have many form in my website but the enter key on my keyboard its not working with those forms as since i click on enter key its just show the same form until i click on the form btn to processing the login process

 public partial class login : System.Web.UI.Page

    {

        string sc = ConfigurationManager.ConnectionStrings["BeravaConnectionString"].ConnectionString.ToString();

        

        protected void Page_Load(object sender, EventArgs e)

        {

            

        }

        protected void Loginbtn_Click(object sender, EventArgs e)

        {

                SqlConnection log = new SqlConnection(ConfigurationManager.ConnectionStrings["BeravaConnectionString"].ConnectionString);

    log.Open();

    string checkuser = "Select count(*) from UserInfo where UID='" + usrnamlogintxtbx.Text + "'";

    SqlCommand cmd = new SqlCommand(checkuser, log);

    int temp = Convert.ToInt32(cmd.ExecuteScalar().ToString());

           

    log.Close();

   

    if (temp == 1)

    {

        log.Open();

        string checkpasswordquery = "Select Password from UserInfo where  UID='" + usrnamlogintxtbx.Text + "'";

        SqlCommand passcom = new SqlCommand(checkpasswordquery, log);

        string password = passcom.ExecuteScalar().ToString().Replace(" ","");

        if (password == usrnamloginpassbx.Text)

        {

            Session["UsrNme"] = usrnamlogintxtbx.Text;

            Response.Redirect("User panel.aspx");

        }

    

    else

    {

        passwronglbl.Text = "Password is incorrect";

    }

    }

        else {

        wronglogusernamelbl.Text = "Invalid User Name";

        }

    }

     

    }

    }