Dapper dot net with mysql, either Fatal or insert all as NULL

my code

string query = @"INSERT INTO representative_dev.representative_users
                                (Username, Password, FullName, 
                                HomePhone, PhoneToCall, 
                                CompanyEmail, PersonalEmail, 
                                IsManager) 
                            VALUES (@Username, @Password, @FullName, 
                                    @HomePhone, @PhoneToCall,
                                    @CompanyEmail, @PersonalEmail, 
                                    @IsManager);";
            mycon.Open();
            int cnt = mycon.Execute(query,
                new
                {
                    txtUsername,
                    txtPassword,
                    txtFullName,
                    txtHomePhone,
                    txtPhoneToCall,
                    txtCompanyEmail,
                    txtPersonalEmail,
                    cbxIsManager
                });
            mycon.Close();

it gives me "Fatal error encountered during command execution."

when i do another insert query in another case it works great, the different is that here i have cbxIsManager as a bool and in the db is a tinyint(1) and in the other case all is strings

if i add "Allow User Variables=true;" then i dont get the exception but in the db all values are null (checked that he gets values)

using ASP.NET at this project, console at the other, both FW4, mysql is 6.somthing (think 3) the other code

        string query = @"INSERT INTO representative_dev.potencial_contact
                    (Name, Company_ID, Phone, Email, Department, Notes, SuperFriend, UpdateDate) 
                    VALUES (@Name, @Company_ID, @Phone, @Email, @Department, @Notes, @SuperFriend, @UpdateDate);";
        mycon.Open();
        int cnt = mycon.Execute(query,
            new
            {
                con.Name,
                con.Company_ID,
                con.Phone,
                con.Email,
                con.Department,
                con.Notes,
                con.SuperFriend,
                con.UpdateDate
            });
        mycon.Close();

any help would be appreciated

thx, ariel

EDIT: when did this it worked

            string query = @"INSERT INTO representative_dev.representative_users
                                (Username, Password, FullName, 
                                HomePhone, PhoneToCall, 
                                CompanyEmail, PersonalEmail, 
                                IsManager) 
                            VALUES ('" + txtUsername + @"', '" + txtPassword + @"', '" + txtFullName + @"', 
                                    '" + txtHomePhone + @"', '" + txtPhoneToCall + @"',
                                    '" + txtCompanyEmail + @"', '" + txtPersonalEmail + @"', 
                                    " + cbxIsManager + ");";

            int cnt = mysql.ExecuteInsert(query);

still looking for help since i would like to use the dapper....