使用互斥量。在进程启动的时候，使用CreateMutex创建互斥量，然后通过GetLastError进行错误检查；如果错误返回的是ERROR_ALREADY_EXISTS，说明已经有一个进程在运行了，只需将这个进程提到前台就行了

ExcelToSQL
..........\AssemblyInfo.vb
..........\bin
..........\...\ExcelToSQL.dll
..........\...\ExcelToSQL.pdb
..........\ExcelToSql.aspx
..........\ExcelToSql.aspx.resx
..........\ExcelToSql.aspx.vb
..........\ExcelToSQL.sln
..........\ExcelToSQL.vbproj
..........\ExcelToSQL.vbproj.webinfo
..........\Global.asax
..........\Global.asax.resx
..........\Global.asax.vb
..........\Styles.css
..........\Web.config

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