那個\0很重要。

using System.Runtime.InteropServices;

public bool DoDBConnect(string strDSN,string strUID,string strPWD)
{
	try
	{
		strConn = "DSN=" + strDSN + ";UID=" + strUID + ";PWD=" + strPWD + ";";
		cn = new OdbcConnection(strConn);
		cmd = new OdbcCommand();
		adp = new OdbcDataAdapter();

		cmd.CommandType = CommandType.Text;
		cmd.Connection = cn;
	}
	catch
	{
		return false;
	}

	return true;
}

[
DllImport("ODBCCP32.dll")
]
private static extern bool SQLConfigDataSource(IntPtr hwndParent, int fRequest, string lpszDriver, string lpszAttributes);

public bool CreateODBCDSN(string strDSN, string strServer, string strDB, string strDescription)
{
	string strSQL = "SERVER=" + strServer + "\0";
	strSQL += "DESCRIPTION=" + strDescription + "\0";
	strSQL += "DSN=" + strDSN + "\0";
	strSQL += "DATABASE=" + strDB + "\0";
	strSQL += "trusted_connection=no\0";
	return SQLConfigDataSource((IntPtr)0, 4, "SQL Server", strSQL);
}