Hello ! i have in asp.net a few textboxes and i wish to update my database with the values that they encapsulate .

The problem is that it doesn't work and although it doesn't work, the syntax seems correct and there are no errors present . Here is my linkbutton :

<asp:linkbutton id="clickOnSave" runat="server" 
                onclick="Save_Click" Text="Save Profile" />

and my update function

protected void Save_Click(object sender, EventArgs e)
{
    SqlConnection con = new System.Data.SqlClient.SqlConnection();
    con.ConnectionString = "DataSource=.\\SQLEXPRESS;AttachDbFilename=C:\\Users\\alex\\Documents\\seeubook_db.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";

    con.Open();

    String commandString = "UPDATE users SET last_name='" + Text4.Text.Trim() + "' , first_name='" + Textbox1.Text.Trim() + "' , about_me='" + Textbox5.Text.Trim() + "' , where_i_live='" +  Textbox2.Text.Trim() + "' ,  where_i_was_born='" + Textbox3.Text.Trim() + "' , work_place='" + Textbox4.Text.Trim() + "' WHERE email='" + Session["user"] + "'";

    SqlCommand sqlCmd = new SqlCommand(commandString, con);
    sqlCmd.ExecuteNonQuery();
    con.Close();
}