Question

I’m using OleDB in a .Net app to read an Access Database table which has a Binary field of fixed length. When I use the MaxLength property on the DataTable it returns -1, although in the Access DB itself I can see the length of the field is 510 bytes. I can’t see the field length anywhere – can you help please.

Answer 1

The data in your cell would be a byte array. You could just take the length of that.

OleDbCommand cmd = new OleDbCommand("select data from db", mycon);
System.Data.OleDb.OleDbDataReader dr;
dr = cmd.ExecuteReader();
dr.Read();
temp = (byte[])dr["data"];
int len = temp.Length;