How to hide an asp:textfield and exclude it from the form layout, or pass a value without using the asp:textfield?

Hello Experts,

I have an asp.net application with a form that captures some information that is stored in a MS SQL database.  I would like to know who creates each record.  I currently have an asp:textbox that captures the current user with:  

creator_txt.Text = System.Web.HttpContext.Current.User.Identity.Name;

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Then I use that text field in a SqlCommand and insert it into a MS SQL Server table using:

SqlCommand new_record_cmd = new SqlCommand("Insert Into tbl(record_nm, creator) Values @record_nm, @creator)))", lcms_cnxn);
                new_record_cmd.Parameters.AddWithValue("@record_nm", record_nm_txt.Text);
                new_record_cmd.Parameters.AddWithValue("@creator", creator_txt.Text);

                lcms_cnxn.Open();
                new_record_cmd.ExecuteNonQuery();
                lcms_cnxn.Close();

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It all works just fine, but I would like this field to be hidden - it doesn't need to be visible in the form.  
Do I need this text field at all?  
If yes, how do I hide the field from the layout and still pass the value of creator_txt to the database?
If not, how do I pass the current user to @creator without using the text field?

I hope this makes sense.  Please ask questions if it's not clear.

I am using Visual Studio 2012, SQL Server Management Studio 2012, asp.net and c#.

Thanks,
J