string myConnectionString=@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=E:\CSharp3\QXKMeTone\bin\Debug\First.mdb;";
			string myExecuteQuery="DELETE * FROM "+tablename;			
			OleDbConnection myConnection = new OleDbConnection(myConnectionString);
			OleDbCommand myCommand = new OleDbCommand(myExecuteQuery, myConnection);
			myCommand.Connection.Open();
			myCommand.ExecuteNonQuery();
			myConnection.Close();