winform实现水印TextBox，亲测完美
资源文件列表
1.重写TextBox/1.重写TextBox.csproj , 4080
1.重写TextBox/bin/Debug/1.重写TextBox.exe , 9728
1.重写TextBox/bin/Debug/1.重写TextBox.pdb , 40448
1.重写TextBox/bin/Debug/1.重写TextBox.vshost.exe , 11600
1.重写TextBox/bin/Debug/1.重写TextBox.vshost.exe.manifest , 490
1.重写TextBox/Form1.cs , 562
1.重写TextBox/Form1.Designer.cs , 2623
1.重写TextBox/Form1.resx , 5817
1.重写TextBox/obj/x86/Debug/1.重写TextBox.csproj.FileListAbsolute.txt , 1627
1.重写TextBox/obj/x86/Debug/1.重写TextBox.csproj.GenerateResource.Cache , 975
1.重写TextBox/obj/x86/Debug/1.重写TextBox.csprojResolveAssemblyReference.cache , 13491
1.重写TextBox/obj/x86/Debug/1.重写TextBox.exe , 9728
1.重写TextBox/obj/x86/Debug/1.重写TextBox.pdb , 40448
1.重写TextBox/obj/x86/Debug/DesignTimeResolveAssemblyReferences.cache , 9942
1.重写TextBox/obj/x86/Debug/DesignTimeResolveAssemblyReferencesInput.cache , 6471
1.重写TextBox/obj/x86/Debug/_1.重写TextBox.Form1.resources , 180
1.重写TextBox/obj/x86/Debug/_1.重写TextBox.Properties.Resources.resources , 180
1.重写TextBox/Program.cs , 497
1.重写TextBox/Properties/AssemblyInfo.cs , 1380
1.重写TextBox/Properties/Resources.Designer.cs , 2884
1.重写TextBox/Properties/Resources.resx , 5612
1.重写TextBox/Properties/Settings.Designer.cs , 1103
1.重写TextBox/Properties/Settings.settings , 249
1.重写TextBox/WaterTextBox.cs , 2675
1.重写TextBox/WaterTextBox.Designer.cs , 1129