get test sqlserver connection,and return bool to check it connected or not.

TEST3\TEST3\bin\Debug\Interop.Excel.dll
.....\.....\...\.....\Interop.Microsoft.Office.Core.dll
.....\.....\...\.....\Interop.VBIDE.dll
.....\.....\...\.....\TEST3.exe
.....\.....\...\.....\TEST3.pdb
.....\.....\...\.....\TEST3.vshost.exe
.....\.....\...\.....\TEST3.vshost.exe.manifest
.....\.....\DbConnect.cs
.....\.....\Form1.cs
.....\.....\Form1.Designer.cs
.....\.....\Form1.resx
.....\.....\frmmain.cs
.....\.....\frmmain.Designer.cs
.....\.....\frmmain.resx
.....\.....\obj\Debug\Interop.Excel.dll
.....\.....\...\.....\Interop.Microsoft.Office.Core.dll
.....\.....\...\.....\Interop.VBIDE.dll
.....\.....\...\.....\TEST3.csproj.FileListAbsolute.txt
.....\.....\...\.....\TEST3.csproj.GenerateResource.Cache
.....\.....\...\.....\TEST3.csproj.ResolveComReference.cache
.....\.....\...\.....\TEST3.exe
.....\.....\...\.....\TEST3.Form1.resources
.....\.....\...\.....\TEST3.frmmain.resources
.....\.....\...\.....\TEST3.pdb
.....\.....\...\.....\TEST3.Properties.Resources.resources
.....\.....\Program.cs
.....\.....\...perties\AssemblyInfo.cs
.....\.....\..........\Resources.Designer.cs
.....\.....\..........\Resources.resx
.....\.....\..........\Settings.Designer.cs
.....\.....\..........\Settings.settings
.....\.....\TEST3.csproj
.....\TEST3.sln
.....\TEST3.suo
.....\.....\obj\Debug\TempPE
.....\.....\bin\Debug
.....\.....\obj\Debug
.....\.....\bin
.....\.....\obj
.....\.....\Properties
.....\TEST3
TEST3

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