C# foreach leads to There is already an open DataReader associated error

I have the following bits of code in my accountRepository

public string[] GetRolesForUser(string email)
{
    // User rolesUser = FindByMail(email);
    IEnumerable<UserRole> RoleList = context.UserRolesSet.Where(u => u.user_id == 1).AsEnumerable();
    string[] arr1 = new string[RoleList.Count()];
    int i = 0;
    foreach (UserRole r in RoleList)
    {
        arr1[i] = r.roles.name;
        i++;
    }
    return arr1;
}

This should work but it doesn't. When it looping through the foreach loop it throws me this error:

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Exception Details: MySql.Data.MySqlClient.MySqlException: There is already an open DataReader associated with this Connection which must be closed first.

Is my foreach loop wrong?

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You could simplify the method:

IEnumerable<UserRole> RoleList = context.UserRolesSet.Where(u => u.user_id == 1);

return RoleList.Select(x => x.roles.name).ToArray();

---

Try the following code. Using ToArray makes sure it populates all of the UserRoles before hand so it'll be finished with the DataReader.

public string[] GetRolesForUser(string email)
{
    // User rolesUser = FindByMail(email);
    IEnumerable<UserRole> RoleList = context.UserRolesSet.Where(u => u.user_id == 1).ToArray();
    string[] arr1 = new string[RoleList.Count()];
    int i = 0;
    foreach (UserRole r in RoleList)
    {
        arr1[i] = r.roles.name;
        i++;
    }
    return arr1;
}