How to verify a User with the supplied user name

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Dear All,

I am having a login page where I need to enter the login name and password for a user, which I need to verify with the backend database, using LINQ.

I have tried but I am not getting.

Can anybody assist.

Following is the underlying code.

C#

protected void Button1_Click(object sender, EventArgs e)
    {
        QuizUserDetailsDataContext context = new QuizUserDetailsDataContext(ConfigurationManager.ConnectionStrings["krs_projectConnectionString"].ToString());
        krs_userinfo k = new krs_userinfo();
        //if(TextBox1.Text.Equals(k.uname.ToString()))
        if(TextBox1.Text.Equals(k.uname) && (TextBox2.Text.Equals(k.password)))


            Response.Redirect("~/Quizaspx.aspx");




    }

This is not working, but not giving any error also.

Many Thanks in Advance.

Posted 13-Sep-10 18:58pm

Mukund Kallapur

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Al-Farooque Shubho · Answer 1 · 2010-09-13T21:29:00

You have declared an object as follows:

krs_userinfo k = new krs_userinfo();

But, as you haven't retrieved this object from the database, this is a blank object. So, the next if statement always evaluates to false.

if(TextBox1.Text.Equals(k.uname) && (TextBox2.Text.Equals(k.password)))

What you might need is something like as follows:

//Retrieve the user from the database by the username and password
krs_userinfo k = GetUserFromDBByUserNameAndPassword(TextBox2.Text,TextBox2.Text);

if(k != null)
{
    //User retrieved from database. So, userName and password is correct
    Response.Redirect("~/Quizaspx.aspx");
}

So, you just need to implement the method GetUserFromDBByUserNameAndPassword(userName,password) which will query the database to retrieve the user object with the supplied userName and password.