sqlCommand does not contain a definition for Parameters

Error 1 ‘vijaystore.DAL.sqlCommand’ does not contain a definition for
‘Parameters’ and no extension method ‘Parameters’ accepting a first
argument of type ‘vijaystore.DAL.sqlCommand’ could be found (are you
missing a using directive or an assembly
reference?) E:\VIJAY\vijaystore\vijaystore\DAL\userDAL.cs 69 21 vijaystore

try
{
    String sql = "INSERT INTO tbl_user (first_name, last_name, email, username, password, contact, address, gender, user_type, added_date, added_by) VALUES (@first_name, @last_name, @email, @username, @password, @contact, @address, @gender, @user_type, @added_date, @added_by)";
    sqlCommand cmd = new sqlCommand(sql, conn);

    cmd.Parameters.AddwithValue("@first_name", u.first_name);
    cmd.Parameters.AddwithValue("@last_name", u.last_name);
    cmd.Parameters.AddwithValue("@email", u.email);
    cmd.Parameters.AddwithValue("@username", u.username);
    cmd.Parameters.AddwithValue("@password", u.password);
    cmd.Parameters.AddwithValue("@contact", u.contact);
    cmd.Parameters.AddwithValue("@address", u.address);
    cmd.Parameters.AddwithValue("@gender", u.gender);
    cmd.Parameters.AddwithValue("@user_type", u.user_type);
    cmd.Parameters.AddwithValue("@added_date", u.added_date);
    cmd.Parameters.AddwithValue("@added_by", u.added_by);

sqlCommand does not contain a definition for Parameters