FarPoint.Win.Spread.Model.IDataSourceSupport dss;
string conStr = "Provider=Microsoft.JET.OLEDB.4.0;data source= " + Application.StartupPath + "\\Patients2000.mdb";
string sqlStr = "SELECT * FROM Patients";
string sqlStr1 = "SELECT * FROM Appointment";
System.Data.OleDb.OleDbConnection conn = new System.Data.OleDb.OleDbConnection(conStr);
DataSet ds = new DataSet();
System.Data.OleDb.OleDbDataAdapter daCust = new System.Data.OleDb.OleDbDataAdapter(sqlStr, conn);
daCust.Fill(ds, "Patients");
System.Data.OleDb.OleDbDataAdapter daOrder = new System.Data.OleDb.OleDbDataAdapter(sqlStr1, conn);
daOrder.Fill(ds, "Appointment");
dss = (FarPoint.Win.Spread.Model.IDataSourceSupport)fpSpread1.ActiveSheet.Models.Data;
dss.DataSource = ds;
dss.DataMember = "Appointment";
fpSpread1.ActiveSheet.Models.Data = (FarPoint.Win.Spread.Model.ISheetDataModel)dss;