In this tutorial, I will show you how to create login form in ASP.NET core. You can easily implement this concept anywhere in .NET applications. I have used some controls to build the login form in a .NET application.

  •  Text Box
  •  Label and Button

Please follow these steps to make this application.
Step 1
First, open your Visual Studio -> File -> New -> Website -> ASP.NET Empty website and click OK. Now, open Solution Explorer and go to Add New Item -> Web form -> click Add.

Step 2
Now, make a Login page like the one given below.
.aspx or design page (front-end)
    <html xmlns="">  
    <head runat="server">  
        <title>Login Form</title>  
        <form id="form1" runat="server">  
                        <td> Username: </td>  
                            <asp:TextBox ID="txtUserName" runat="server" />  
                            <asp:RequiredFieldValidator ID="rfvUser" ErrorMessage="Please enter Username" ControlToValidate="txtUserName" runat="server" /> </td>  
                        <td> Password: </td>  
                            <asp:TextBox ID="txtPWD" runat="server" TextMode="Password" />  
                            <asp:RequiredFieldValidator ID="rfvPWD" runat="server" ControlToValidate="txtPWD" ErrorMessage="Please enter Password" /> </td>  
                        <td> </td>  
                            <asp:Button ID="btnSubmit" runat="server" Text="Submit" /> </td>  

Now, create an event for click button, such as -  onclick="<>".

So, our button tag will be like <asp:Button ID="btnSubmit" runat="server" Text="Submit" onclick="btnSubmit_Click" />. And in login.aspx.cs page, we need to write the following code.

C# Code --Code behind(Aspx.cs)
    using System;  
    using System.Data;  
    using System.Data.SqlClient;  
    using System.Configuration;  

After adding the namespaces, write the following code in code behind.
    protected void btnSubmit_Click(object sender, EventArgs e) {  
        SqlConnection con = newSqlConnection(ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString);  
        SqlCommand cmd = new SqlCommand("select * from UserInformation where UserName =@username and Password=@password", con);  
        cmd.Parameters.AddWithValue("@username", txtUserName.Text);  
        cmd.Parameters.AddWithValue("@password", txtPWD.Text);  
        SqlDataAdapter da = new SqlDataAdapter(cmd);  
        DataTable dt = new DataTable();  
        if (dt.Rows.Count > 0) {  
        } else {  
            ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Invalid Username and Password')</script>");  

Now, for connecting it with the database, write the database connection string like the following.

Web Config
        <add name="dbconnection" connectionString="Data Source=BrajeshKr;Integrated Security=true;Initial Catalog=MyDB" /> </connectionStrings>

That's it. Now, our Login page is ready to be executed. You can download the code for this application and run that on your Visual Studio. ASP.NET Core 1.1 Hosting

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