C# loginsystem to SQLserver?

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3.00/5 (2 votes)

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have a BIG problem with this matter.

i make a database using C# and i don't know how to connect it to SQL server.

<pre lang="xml"><pre lang="xml"><%@ Page Language="C#" AutoEventWireup="true" CodeFile="Login.aspx.cs" Inherits="Login" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Login</title>
</head>
<body>
    <form id="form1" runat="server">
    <div id="DIV1">
        <asp:Login ID="Login1" runat="server" BackColor="White" BorderColor="Blue" BorderStyle="Solid"
            BorderWidth="1px" CreateUserText="Create New User" CreateUserUrl="~/create.aspx"
            DestinationPageUrl="front.aspx" Font-Names="Verdana" Font-Size="10pt" PasswordRecoveryText="Forgot Password?"
            PasswordRecoveryUrl="forgotpass.aspx" OnAuthenticate="Login1_Authenticate">
            <TitleTextStyle BackColor="Blue" Font-Bold="True" ForeColor="White" />
        </asp:Login>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:TestSQLConnectionString %>"
            SelectCommand="SELECT * FROM [Admin]"></asp:SqlDataSource>
    </div>
    </form>
</body>
</html>

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;
public partial class Login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Page.IsValid)
        {
            String strConn = "PROVIDER=Microsoft.Jet.OLEDB.4.0;DATA SOURCE=" + Server.MapPath("DBAuth.mdb") + ";";
            OleDbConnection Conn = new OleDbConnection(strConn);            Conn.Open();
            String strSQL = "SELECT Pwd FROM Tbl_MA_Users WHERE Email = '" + txtEmail.Text + "'";
            OleDbCommand Cmd = new OleDbCommand(strSQL, Conn);
            //Create a datareader, connection object
            OleDbDataReader Dr = Cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
            //Get the first row and check the password.
            if (Dr.Read())
            {
                if (Dr["Pwd"].ToString() == txtPwd.Text)
                    FormsAuthentication.RedirectFromLoginPage(txtEmail.Text, false);
                else
                    lblLoginMsg.Text = "Invalid password.";
            }
            else
                lblLoginMsg.Text = "Login name not found.";
            Dr.Close();
        }
 
    }
    protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
    {
    }
}

and i have a problem in this line.

String strSQL = "SELECT Pwd FROM Tbl_MA_Users WHERE Email = '" + txtEmail.Text + "'";

i hope you can help.

Posted 26-Apr-11 21:20pm

chaosgray

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Comments

R. Giskard Reventlov 27-Apr-11 3:23am

You need to say what the problem is. Also, looks like you're using an Access database (the connection string is set up for Access) not Sql Server.

Ankit Rajput 27-Apr-11 3:26am

He has asked it third time.

chaosgray 27-Apr-11 3:29am

how can connect it from the sql server? pls. help me.

3 solutions

Solution 1

The connection string is set up for MSAccess not for Sql Server, so this might could be the reason for not connecting.

Posted 26-Apr-11 21:26pm

Ramalinga Koushik

Comments

chaosgray 27-Apr-11 3:27am

so, how can i connect it from the sql server? pls. help me.

RDBurmon 27-Apr-11 4:03am

Search this on google "Connection string for sql server "

Solution 2

Hi,

Please see the connection string from this site.
Connection Strings

Regards
AR

Posted 26-Apr-11 21:34pm

Ankit Rajput

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Shahriar Nour Khondokar · Accepted Answer · 2011-04-27T23:53:00

To connect to SQL Server from C#.NET, you need to create a connection string such as below:

private SqlConnection connection;
private string connectionString =
@"Server=(local);Database=Embedding_SQL_Test;User ID=sa;Password=123";
connection = new SqlConnection( connectionString );

Next, you use the

SqlConnection

object created above to create a 'SqlCommand', as shown below:

SqlCommand cmd = new SqlCommand( "select * from Customer where CustomerID = @Cid", connection);

The SQL query shown here can be replaced by a SELECT, INSERT, UPDATE queries etc.

Next to execute the SQL queries in the database, you use the following methods:
ExecuteReader - to execute SELECT queries
ExecuteNonQuery - to execute INSERT, DELETE, UPDATE, and SET statements.

This is a very short description of how to connect to SQL Server database from C# and execute SQL queries in the database.
For details about the connection string, the methods and their parameters check the following link: ( http://www.shahriarnk.com/Shahriar-N-K-Research-Embedding-SQL-in-C-Sharp-Java.html )
Here you will also find details about how to pass parameters to the SQL queries as well as calling stored procedures and much more.