Question

I have a simpe table:

Users
UserID     Guid   doesnt allow null
Avatar     image  allows null
Reputation int    allows null

I used the following statement:

string insertCommand = "INSERT INTO Users (UserID) VALUES" +""+ "('"+UsersIdentityToinsert+"')";

UsersIdentityToinsert(this value is a Guid, I checked its value, it isn’t null).

There were no exceptions thrown. As soon as the user presses the login button, he is transfered to another page, and his record is inserted.
I followed with the debugging that that statement is executed.

When I return to my server explorer in Visual Studio 2010 and click refresh the Users table is empty. Why is that?

Connection string

<add name="YourGuruDB" connectionString="Data Source=DIMA-00AA1DA557;Initial Catalog=model;Integrated Security=True"/>

i retrieve it from config into the code:

WebConfigurationManager.ConnectionStrings["YourGuruDB"].ConnectionString;

Added:

    public static void InsertUsers(Guid UsersIDentity)
{
    SqlConnection sqlConnect = getSqlConnection();
    SqlCommand sqlCommand = new SqlCommand(RegisterAdo.insertCommand(UsersIDentity), sqlConnect);//insert command method returns the insert statement described above
    try
    {
        sqlConnect.Open();
        sqlCommand.ExecuteNonQuery();

    }
    catch (Exception x)
    {
        HttpContext.Current.Response.Redirect("~/ErrorPage.aspx?Error=" + WRITE_ERROR);

    }
    finally
    {
        sqlConnect.Close();
    }
}

Answer 1

Instead of using

"INSERT INTO Users (UserID) VALUES" +""+ "('"+UsersIdentityToinsert+"')";

use this:

"INSERT INTO Users (UserID) VALUES" +""+ "(CONVERT(uniqueidentifier, '"+UsersIdentityToinsert+"'))";

And you really should use a prepared Statement instead of concatenating the sql.

What about the DB-connection? Did you run any successfull statements so far? Try a simple select.