using System.IO; 
using System.Data.OleDb; //連接Access數(shù)據(jù)庫(kù) 
using ADOX;        
//引用COM：Microsoft ADO Ext. 2.8 for DDL and Security 
//添加引用：Microsoft ActioveX Data Objects 2.8 Library 

 string conn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileName; 
//創(chuàng)建數(shù)據(jù)庫(kù) 
 ADOX.Catalog catalog = new Catalog(); 
 try 
 { 
  catalog.Create(conn); 
 } 
 catch 
 {} 
 
 //連接數(shù)據(jù)庫(kù) 
 ADODB.Connection cn = new ADODB.Connection(); 
 cn.Open(conn, null, null, -1);       
 catalog.ActiveConnection = cn; 
 
 //新建表 
 ADOX.Table table = new ADOX.Table(); 
 table.Name = "AdPlayList"; 
  
 ADOX.Column column = new ADOX.Column(); 
 column.ParentCatalog = catalog; 
 column.Type = ADOX.DataTypeEnum.adInteger; // 必須先設(shè)置字段類(lèi)型 
 column.Name = "ID"; 
 column.DefinedSize = 9; 
 column.Properties["AutoIncrement"].Value = true; 
 table.Columns.Append(column, DataTypeEnum.adInteger, 0); 
 //設(shè)置主鍵 
 table.Keys.Append("PrimaryKey", ADOX.KeyTypeEnum.adKeyPrimary, "ID", "", ""); 
  
 table.Columns.Append("FileName", DataTypeEnum.adVarWChar, 50); 
 table.Columns.Append("FileDate", DataTypeEnum.adDate, 0); 
 table.Columns.Append("FileSize", DataTypeEnum.adInteger, 9); 
 table.Columns.Append("OrderID", DataTypeEnum.adInteger, 9); 
 table.Columns.Append("Sha1", DataTypeEnum.adVarWChar, 50); 
 
try 
 { 
  catalog.Tables.Append(table); 
 } 
 catch (Exception ex) 
 { 
  MessageBox.Show(ex.Message); 
 } 
 //此處一定要關(guān)閉連接，否則添加數(shù)據(jù)時(shí)候會(huì)出錯(cuò) 
  
 table = null; 
 catalog = null; 
 Application.DoEvents(); 
 cn.Close(); 

//創(chuàng)建不帶密碼的連接語(yǔ)句 
string conn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileName; 
//創(chuàng)建加密碼的連接語(yǔ)句，pwd是密碼 

ALTER DATABASE PASSWORD [NewPassword] [OldPassword] 

 string conn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileName + ";Jet OLEDB:Database password=" + openpwd; 
string sql = "ALTER DATABASE PASSWORD " + newpwd + " " + openpwd; 
ADODB.Connection cn = new ADODB.Connection(); 
cn.Mode = ADODB.ConnectModeEnum.adModeShareExclusive; 
cn.Open(conn, null, null, -1); 
// 執(zhí)行 SQL 語(yǔ)句以更改密碼。 
object num; 
cn.Execute(sql, out num, -1); 
 cn.Close();