"Could not find installable ISAM" (0x80004005) error message when you try to set session-level Jet properties

This article was previously published under Q318161

Caution ADO and ADO MD have not been fully tested in a Microsoft .NET Framework environment. They may cause intermittent issues, especially in service-based applications or in multithreaded applications. The techniques that are discussed in this article should only be used as a temporary measure during migration to ADO.NET. You should only use these techniques after you have conducted complete testing to make sure that there are no compatibility issues. Any issues that are caused by using ADO or ADO MD in this manner are unsupported. For more information, see the following article in the Microsoft Knowledge Base:

Dim cnn As New ADODB.Connection
cnn.Open "Provider=Microsoft.Jet.OLEDB.4.0;"
cnn.Properties("Jet OLEDB:Max Buffer Size") = 256
				

Dim cnn As New ADODB.Connection
cnn.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\db1.mdb;Jet OLEDB:Max Buffer Size=256;"
				

try
{
    OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\DB1.MDB;Jet OLEDB:Max Buffer Size=256;"); 
    conn.Open();
}
catch(OleDbException e)
{
    MessageBox.Show("Error code= "+ e.ErrorCode.ToString("X")+"\nError Description="+e.Message);
}