C#做的一个Windows窗体应用，连接了数据库，但是调试的时候出现一个错误，求大神指点误

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Csc.exe /noconfig /nowarn:1701,1702 /nostdlib+ /platform:x86 /errorreport:prompt /warn:4 /define:DEBUG;TRACE /errorendlocation /preferreduilang:zh-CN /highentropyva- /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\Microsoft.CSharp.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\mscorlib.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.Configuration.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.Core.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.Data.DataSetExtensions.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.Data.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.Deployment.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.Drawing.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.Windows.Forms.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.Xml.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Profile\Client\System.Xml.Linq.dll" /debug+ /debug:full /filealign:512 /optimize- /out:obj\x86\Debug\jishengban2.exe /resource:obj\x86\Debug\jishengban2.Form1.resources /resource:obj\x86\Debug\jishengban2.Properties.Resources.resources /target:winexe /utf8output Form1.cs Form1.Designer.cs Program.cs Properties\AssemblyInfo.cs sqlhelper.cs Properties\Resources.Designer.cs Properties\Settings.Designer.cs "C:\Users\Administrator\AppData\Local\Temp.NETFramework,Version=v4.0,Profile=Client.AssemblyAttributes.cs"