An error occurred connecting to the ACCESS database: the installable ISAM could not be found

An error occurred connecting to the ACCESS database: the installable ISAM could not be found

When I checked, I found that I had written Data Source as DataSource

Error: < add key="OleConnection" value="Provider=Microsoft.Jet.OleDb.4.0;DataSource=Demo.mdb;" / >

Correct: < add key="OleConnection" value="Provider=Microsoft.Jet.OleDb.4.0;Data Source=Demo.mdb;" / >

Note: Database in MSSQL

< add key="SQLConnection" value="server=.;uid=sa;pwd=sa;database=Demo;" / >