Hello, all.

I think it is better place to post, instead of *.data.ado. Sorry for
multiposting.

Last four hours I fought with very strange error. When I try to open a table
through simple query (select * from TableName) ADO (OLEDB) gives to me
abovementioned error message. Some tables are opened without a problem but
for some tables there is error. I tried to determine what is the difference
between these tables and was very surprised. This error happens when table
have nvarchar fields with maximum length more than 127. For example this
table will be opened without problems:

For this table opening works

create table Projects(
 ID integer identity (0, 1) constraint PK_Projects primary key,
 Name nvarchar (127) not null);

but this table won't open

For this table opening doesn't work

create table Projects(
 ID integer identity (0, 1) constraint PK_Projects primary key,
 Name nvarchar (255) not null);

Both tables perfectly opened through Visual Studio 2008. I suppose it uses
ADO.NET but I use ADO (OLEDB) from program written on Delphi. Could someone
direct me to the place in the documentation where such restriction is
mentioned? Andy why such non-informative error message?