/// <summary>
/// Deletes a login record from a user in the UserLogins table.
/// </summary>
/// <param name="user">User to have login deleted.</param>
/// <param name="login">Login to be deleted from user.</param>
/// <returns></returns>
public int Delete(IdentityUser user, UserLoginInfo login)
{
string commandText = "DELETE FROM " + fullTableName + " WHERE " + fielduserID.Quote() + " = @userId AND " + fieldLoginProvider.Quote() + " = @loginProvider " +
" AND " + fieldProviderKey.Quote() + " = @providerKey";
Dictionary <string, object> parameters = new Dictionary <string, object>();
parameters.Add("userId", user.Id);
parameters.Add("loginProvider", login.LoginProvider);
parameters.Add("providerKey", login.ProviderKey);
return(_database.ExecuteSQL(commandText, parameters));
}