1. System.Data.Odbc.OdbcConnection conn = new System.Data.Odbc.OdbcConnection(); 
2. conn.ConnectionString = @"Driver={Microsoft dBase Driver (*.dbf)};SourceType=DBF;SourceDB=D:\databases\;Exclusive=No; Collate=Machine;NULL=NO;DELETED=NO;BACKGROUNDFETCH=NO;"; 
3. conn.Open(); 
4. System.Data.Odbc.OdbcCommand cmd = conn.CreateCommand();
5. cmd.CommandText = @"SELECT * FROM " + openFileDialog1.FileName.ToString();
6. DataTable dt = new DataTable(); 
7. dt.Load(cmd.ExecuteReader()); 
8. conn.Close();

using System.IO;
...
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
System.Data.Odbc.OdbcConnection conn = new System.Data.Odbc.OdbcConnection(); 
conn.ConnectionString = @"Driver={Microsoft dBase Driver (*.dbf)};SourceType=DBF;SourceDB=D:\databases\;Exclusive=No; Collate=Machine;NULL=NO;DELETED=NO;BACKGROUNDFETCH=NO;"; 
conn.Open(); 
System.Data.Odbc.OdbcCommand cmd = conn.CreateCommand();
cmd.CommandText = @"SELECT * FROM " + Path.GetDirectoryName(openFileDialog1.FileName) + "\\" + Path.GetFileName(openFileDialog1.FileName);
DataTable dt = new DataTable(); 

...

conn.Close();
}
...