Simple Login Form in ASP.Net Using C#

Introduction

This article shows how to make a simple Login Form in ASP.Net Using C#.

There are two inputs, a Username and Word, and a login button. When the user clicks that login button, the user is redirected to a new page (his account page). Otherwise, it gets an error message.

Initial Chamber

Step 1. Open Your Visual Studio 2010 and create an Empty Website; provide a suitable name (LoginForm_demo).

Step 2. In Solution Explorer, you get your empty website, then add two web forms and an SQL Server database as in the following.

For Web Form

Right-click LoginForm_demo (your empty website), then select Add New Item -> Web Form. Name it Login_demo.aspx. Use that process again, add another web form, and name it Redirectpage.aspx.

For SQL Server Database

Right-click LoginForm_demo (your empty website), then select Add New Item -> SQL Server Database. Add the database inside the App_Data_folder.

Database Chamber

Step 3. In Server Explorer, click on your database (Database.mdf), then select Tables -> Add New Table. Make the table like this.

Table -> tbl_data (Don't forget to make the ID as IS Identity = True).

Figure 1. Database Chamber

Now enter some data into your database by right-clicking Tables, then select Show Table Data and enter whatever you want to add in the username and word. I entered the following data.

Figure 2. Database Table

We will match this username and word, so if the data is correct, the user is redirected to his account page; otherwise, the user gets an error message.

DESIGN CODE

Step 4. Now make some designs for your application by going to Login_demo.aspx and try the code as in the following.

Login_demo.aspx

You will get something like this.

Figure 3. Login Form

CODE CHAMBER

Step 5. We will provide some code in the Login_demo.aspx.cs page so that our login form works.

Login_demo.aspx.cs

Figure 4. Login Demo

public partial class _Default: System.Web.UI.Page {  
    protected void Page_Load(object sender, EventArgs e) {  
  
    }  
    protected void Button1_Click(object sender, EventArgs e) {  
        SqlConnection con = new SqlConnection(@  
        "Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True;User Instance=True");  
        SqlCommand cmd = new SqlCommand("select * from tbl_data where username=@username and word=@word", con);  
        cmd.Parameters.AddWithValue("@username", TextBox1.Text);  
        cmd.Parameters.AddWithValue("word", TextBox2.Text);  
        SqlDataAdapter sda = new SqlDataAdapter(cmd);  
        DataTable dt = new DataTable();  
        sda.Fill(dt);  
        con.Open();  
        int i = cmd.ExecuteNonQuery();  
        con.Close();  
  
        if (dt.Rows.Count > 0) {  
            Response.Redirect("Redirectform.aspx");  
        } else {  
            Label1.Text = "Your username and word is incorrect";  
            Label1.ForeColor = System.Drawing.Color.Red;  
  
        }  
  
  
    }  
}  

Output

This is your final output. As you can see, this is our Default.aspx page (in your terms, Login_demo.aspx). When the user clicks on the login button, the user is redirected to a new page (Redirectpage.aspx).

Figure 5. Output

Figure 6. Welcome Page

I hope you like it. Thank you for reading. Have a nice Day!