Login through membership

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ASP.NET

Hi

I am using membership for login page,and registration ,
my registration code is working fine , but login is page is not working pls help
here is the code..

MembershipUserCollection obj = System.Web.Security.Membership.FindUsersByName(txtname.Text);
           if (obj.Count == 1)
           {
               SqlParameter[] sqlParam = { new SqlParameter("UserName", SqlDbType.VarChar) };
               sqlParam[0].Value = txtname.Text;

               DataSet dsLoginDetails = SqlHelper.ExecuteDataset(ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString, CommandType.StoredProcedure, "up_login", sqlParam);

               if (dsLoginDetails.Tables[0].Rows.Count.Equals(1))
               {
                   if (CalculateMD5Hash(Password.Text) == dsLoginDetails.Tables[0].Rows[0].ItemArray[0].ToString())
                   {
                       string [] roles = Roles.GetRolesForUser(txtname.Text);
                       if (roles[0] == "Admin")
                       {
                           // Add session
                           //Session["username"] = txtname.Text; I think its not converting to MD5, membership is converting to something else maybe SHA

                           Session.Add("username", txtname.Text);
                           Response.Redirect("~/adminpage.aspx",false);
                       }
                           else if (dsLoginDetails.Tables[0].Rows[0].ItemArray[1] == "teacher") ;
                           {
                               Session["username"] = txtname.Text;

                               Response.Redirect("teacher.aspx");
                           }
                       }
                       else
                       {
                           lblfail.Text = "login fail";
                       }

                   }
               }
           }
       }
   }

public string MD5Hash(string text)
        {
            MD5 md5 = new MD5CryptoServiceProvider();

            //compute hash from the bytes of text
            md5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(text));

            //get hash result after compute it
            byte[] result = md5.Hash;

            StringBuilder strBuilder = new StringBuilder();
            for (int i = 0; i < result.Length; i++)
            {
                //change it into 2 hexadecimal digits
                //for each byte
                strBuilder.Append(result[i].ToString("x2"));
            }
            return strBuilder.ToString();
        }