How to retrieve only the data related to the user logged in during that time.

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C#

protected void Page_Load(object sender, EventArgs e)
    {
        
        if (Session.IsNewSession)
        {
            Response.Redirect("Login.aspx");
        }
       
        if (!Page.IsPostBack)
        {
            string str = System.Configuration.ConfigurationManager.ConnectionStrings["CensusConnectionString"].ConnectionString;
            SqlConnection con = new SqlConnection(str);
            if (con.State == ConnectionState.Closed)
            {
                con.Open();
            }
            string @sessionId = System.Web.HttpContext.Current.Session.SessionID;
            SqlDataAdapter da = new SqlDataAdapter("select * from ureg", con);
            DataTable dt = new DataTable();
            da.Fill(dt);
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        foreach (GridViewRow vrow in GridView1.Rows)
        {
            string card = GridView1.DataKeys[vrow.RowIndex].Value.ToString();
            string str = System.Configuration.ConfigurationManager.ConnectionStrings["CensusConnectionString"].ConnectionString;
            SqlConnection con = new SqlConnection(str);
            if (con.State == ConnectionState.Closed)
            {
                con.Open();
            }
            SqlDataAdapter da = new SqlDataAdapter("select * from ureg where card='"+card+"'", con);
            DataTable dt = new DataTable();
            da.Fill(dt);
            Session["fnm"] = dt.Rows[0]["fname"].ToString();
            Session["lnm"] = dt.Rows[0]["lname"].ToString();
            Session["gen"] = dt.Rows[0]["gender"].ToString();
            Session["cat"] = dt.Rows[0]["catagory"].ToString();
            Session["add"] = dt.Rows[0]["adr"].ToString();
            Session["dob"] = dt.Rows[0]["dob"].ToString();
            Session["ct"] = dt.Rows[0]["city"].ToString();
            Session["pin"] = dt.Rows[0]["pin"].ToString();
            Session["state"] = dt.Rows[0]["state"].ToString();
            Session["mail"] = dt.Rows[0]["mail"].ToString();
            Session["ph"] = dt.Rows[0]["phno"].ToString();
            Session["card"] = dt.Rows[0]["card"].ToString();
            Response.Redirect("update_user.aspx");
        }
    }

C#

I have this code behind file.it is showing all data of the table "ureg" after logged into the page.But i want to retrieve only the data related to the user logged in during that time.
please provide me the necessary solution to solve this problem.

Posted 22-Nov-15 22:00pm

Member 10585568

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Comments

Richard Deeming 23-Nov-15 9:55am

Your code is vulnerable to SQL Injection[^].

NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query.

Everything you wanted to know about SQL injection (but were afraid to ask) | Troy Hunt[^]
How can I explain SQL injection without technical jargon? | Information Security Stack Exchange[^]
Query Parameterization Cheat Sheet | OWASP[^]
SQL injection attack mechanics | Pluralsight [^]

3 solutions

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Santhakumar M · Answer 1 · 2015-11-23T03:52:00

Hi,

Kindly follow the below steps

Step: 1

You have to get the user id while logged in login page. then, you can store the user id on session object.

session.add("User_Id",txtUserId.Text.ToString().Trim())

Step: 2

After you logged in successfully, you can check the user_id session object is null or not condition. then, you can request database to retrieve the data for the particular user as below

if(session["User_Id"]!=null)
{
string str = System.Configuration.ConfigurationManager.ConnectionStrings["CensusConnectionString"].ConnectionString;
            SqlConnection con = new SqlConnection(str);
            if (con.State == ConnectionState.Closed)
            {
                con.Open();
            }
            string @sessionId = System.Web.HttpContext.Current.Session.SessionID;
            SqlCommand cmd=new SqlCommand("Select * from ureg where user_id=@user_id", con);          cmd.Parameters.AddWithValue("@user_id",session["User_Id"].ToString().Trim());
SqlDataAdapter da=new SqlDataAdapter(cmd);         
            DataTable dt = new DataTable();
            da.Fill(dt);
            GridView1.DataSource = dt;
            GridView1.DataBind();
}

I hope it can be helpful to you

ZurdoDev · Answer 2 · 2015-11-23T02:10:00

Solution 1

You have SQL that shows "select * from ureg". Just add a where clause on to it so you only get back the row you need.

Posted 23-Nov-15 2:10am

ZurdoDev

Arasappan · Answer 3 · 2015-11-23T02:22:00

Solution 2

During the login... Get The ID of the user by means of Session..

After That

Create a label and assign the Session Value on it

If LAble id is lbl_ureg_id mean..

lbl_ureg_id.Text=Session["userid"].ToString();

select * from ureg where uregId='"+ lbl_ureg_id.Text +"'

Posted 23-Nov-15 2:22am

Arasappan

Comments

Arasappan 23-Nov-15 8:22am

Google Session

Richard Deeming 23-Nov-15 9:54am

NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query.

Everything you wanted to know about SQL injection (but were afraid to ask) | Troy Hunt[^]
How can I explain SQL injection without technical jargon? | Information Security Stack Exchange[^]
Query Parameterization Cheat Sheet | OWASP[^]
SQL injection attack mechanics | Pluralsight [^]