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public async Task<bool> LeaveSchool(string schid)
{
    try
    {
        var getschoolkey = (await client
            .Child($"StudentAccount/{key}/Schools")
            .OnceAsync<Schools>()).FirstOrDefault
            (a => a.Object.SchoolID == schid);
        if (getschoolkey != null)
        {
            await client
                .Child($"StudentAccount/{key}/Schools")
            .Child(getschoolkey.Key)
                .DeleteAsync();
            client.Dispose();
            return true;
        }

        client.Dispose();
        return false;
    }
    catch
    {
        client.Dispose();
        return false;
    }
}