如何用代码实现在应用程序当前目录新建sql server数据库？? 400 报错

哇，第一次离老大这么近！老大好！

局部代码如下：

string connString = @"server=.\sqlexpress;integrated security=SSPI;database=master";
            SqlConnection myConn = new SqlConnection(connString);
            
            string str = "CREATE DATABASE MyDatabase ON PRIMARY " +
            "(NAME = MyDatabase_Data, " +
            "FILENAME = Application.ExecutablePath+"+"\\MyDatabaseData.mdf,"+
            "SIZE = 3MB, MAXSIZE = 10MB, FILEGROWTH = 10%) " +
            "LOG ON (NAME = MyDatabase_Log, " +
            "FILENAME = Application.ExecutablePath+" + "\\MyDatabaseLog.ldf'," +
            "SIZE = 1MB, " +
            "MAXSIZE = 5MB, " +
            "FILEGROWTH = 10%)";

            SqlCommand myCommand = new SqlCommand(str, myConn);
            try
            {
                myConn.Open();
                myCommand.ExecuteNonQuery();

出错的提示：

False!System.Data.SqlClient.SqlException: '.' 附近有语法错误。
字符串 ',SIZE = 1MB, MAXSIZE = 5MB, FILEGROWTH = 10%)' 后的引号不完整。
   在 System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolea
n breakConnection)
   在 System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception
, Boolean breakConnection)
   在 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObj
ect stateObj)
   在 System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cm
dHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, Tds
ParserStateObject stateObj)
   在 System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName,
Boolean async)
   在 System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult res
ult, String methodName, Boolean sendToPipe)
   在 System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   在 CreateSql.Program.Main(String[] args) 位置 C:\Documents and Settings\Tansi
on\桌面\create database\ConsoleApplication1\ConsoleApplication1\Program.cs:行号
31

里面说的行号31是指

myCommand.ExecuteNonQuery();   这一句