How to store data from Database in Session variable in ASP.Net

Consider the example of login when user login to the website then its username and password will be stored in the session. so here i have stored the session information in Database

HTML:

<form id="form1" runat="server">
    <div>
        UserName
        <asp:TextBox ID="txtUserName" runat="server"></asp:TextBox><br />
        Password
        <asp:TextBox ID="txtPassword" TextMode="Password" runat="server"></asp:TextBox><br />
        <asp:Button ID="btnLogin" runat="server" Text="Login" OnClick="Login" />
    </div>
    </form>

C#:

protected void Login(object sender, EventArgs e)
    {
        Session["UserName"] = this.txtUserName.Text.Trim();
        Session["Password"] = this.txtPassword.Text.Trim();
        string insertSatement = "Insert into Session(UserName,Password) Values(@UserName,@password)";
        string conStr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        using (SqlConnection con = new SqlConnection(conStr))
        {
            using (SqlCommand cmd = new SqlCommand(insertSatement, con))
            {
                con.Open();
                cmd.Parameters.AddWithValue("@UserName", Session["UserName"].ToString());
                cmd.Parameters.AddWithValue("@Password", Session["Password"].ToString());
                cmd.ExecuteNonQuery();
                con.Close();
            }
        }
    }

Thanks