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Thread: Validate username and Password using Login Control and SQL

  1. #1

    Thread Starter
    Learning .Net danasegarane's Avatar
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    Thumbs up Validate username and Password using Login Control and SQL

    n this code Snippet I am going to show how to use the Login Control with SQL for Authenticate UserName and password

    PHP Code:
    1.Place one Login Control Named Login1
    2.
    Declare Public Varriable named strErrorDescription 
    Code:
    protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
        {
            Boolean bauthenticated = false;
            bauthenticated = isValidUser(Login1.UserName, Login1.Password);
            if (bauthenticated)
            {
                e.Authenticated = true;
            }
    
            else
            {
                e.Authenticated = false;
            }
        }
    Code For Validating userName and Password in SQLTable

    This part of the code will check the username and password from the SQLTable
    Code:
    private Boolean isValidUser(string username, string pwd)
        {
            SqlConnection con = new SqlConnection("DataBase=Northwind;Server=(local);User ID=sa;Password=test");
            SqlCommand cmd = new SqlCommand("select * from users where userid='" + username + "'");// and pwd='" + pwd + "'");
            cmd.Connection = con;
            DataTable dt = new DataTable();
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            con.Open();
            da.Fill(dt);
            con.Close();
            if (dt.Rows.Count == 0)
            {
                strLoginErrorMsg = "Invalid UserName";
                dt.Dispose();
                return false;
            }
            else
            {
                string strTemppwd=Convert.ToString(dt.Rows[0]["pwd"]).Trim();
                if (strTemppwd.ToLower() != Login1.Password.ToLower())
                {
                    strLoginErrorMsg = "Invalid Password";
                }
            }
            return true;
           }


    OverRide the ErrorMessage

    Code:
    protected void Login1_LoginError(object sender, EventArgs e)
        {
            Login1.FailureText = strLoginErrorMsg;
        }

    Happy Coding
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    www.techreceipe.tk


  2. #2

    Thread Starter
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    Re: Validate username and Password using Login Control and SQL

    Login Control :

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  3. #3
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    Re: Validate username and Password using Login Control and SQL

    Hi danasegarane:

    thanks for this code and so :
    how to logout on this method and so disable back button browser or can not be able back on page?????!!!!

  4. #4
    ASP.NET Moderator gep13's Avatar
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    Re: Validate username and Password using Login Control and SQL

    Hey,

    You can use the LoginStatus control to provide you with this functionality.

    As for disabling the back button, why would you want to do this? Once the user is logged out, they are no longer authenticated, and as such will be prompted to log in again if they hit the back button.

    Gary

  5. #5
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    Re: Validate username and Password using Login Control and SQL

    Quote Originally Posted by danasegarane View Post
    Login Control :

    Hi Danasegaran,

    When I tried I am getting error. An object Reference is required for the nonstatic field, method, or property.

    and

    System.Web.UI.WebControls.Login does not contain a definitiion for "Password"

    Please help me

    thanks,

    Sounar

  6. #6

    Thread Starter
    Learning .Net danasegarane's Avatar
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    Re: Validate username and Password using Login Control and SQL

    Hi Sundar ,
    Welcome to the Forums. I doubt you are not calling the Actual Control name rather than Base control Property.

    Take this Example
    1. You drag and drag a Login Control in your form and the name will be Login1
    2. And for getting the Password control associated with the Login Control you need
    to use the Login1.Password property.
    Where
    the Login1 is the control name
    the Password is the Password Text Associated with the Password
    control inside the login control.

    Hope this helps
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  7. #7
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    Re: Validate username and Password using Login Control and SQL

    Hi Dhasekaran,

    Thanks for helping me. Since my laptop became very slow I formatted the hard disk and Installed windows 7 and visual studio 2008. Still I am not able to custom username and password error message using login control. And also I wanted use role based validation using sql 2008. Kindly help me.

    Soundar

  8. #8
    ASP.NET Moderator gep13's Avatar
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    Re: Validate username and Password using Login Control and SQL

    Hey,

    Can you upload the code that you are currently using?

    Gary

  9. #9
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    Re: Validate username and Password using Login Control and SQL

    Hi Dhanasegarene,

    How do I declare strLoginErrorMsg and strErrorDescription.

    Thanks,

    Soundar

  10. #10
    ASP.NET Moderator gep13's Avatar
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    Re: Validate username and Password using Login Control and SQL

    Soundar,

    I think it would help if you were to describe exactly what it is that you are trying to achieve. Do you actually require to validate a username and password against an existing database. From what you have posted, and the questions you are asking, it would appear that you are just starting out, is that correct? If so, why not let ASP.Net do the "heavy" lifting for you, and use the built in SQL Database and Tables that it creates for you.

    Gary

  11. #11
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    Re: Validate username and Password using Login Control and SQL

    hi..
    i am new to coding plz help me out.
    error is
    The name 'strLoginErrorMsg' does not exist in the current context
    plz help

  12. #12
    ASP.NET Moderator gep13's Avatar
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    Re: Validate username and Password using Login Control and SQL

    Hello,

    strLoginErrorMsg needs to be declared at the top of your code file, in the same way that strErrorDescription is.

    Does this make sense?

    Gary

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