Homemade tank program, can only move up and down, not a bullet, who hope to improve

Tank\Tank\bin\Debug\Tank.exe
....\....\...\.....\Tank.pdb
....\....\...\.....\Tank.vshost.exe
....\....\ClassDiagram1.cd
....\....\Form1.cs
....\....\Form1.Designer.cs
....\....\Form1.resx
....\....\obj\Debug\Tank.csproj.FileListAbsolute.txt
....\....\...\.....\Tank.csproj.GenerateResource.Cache
....\....\...\.....\Tank.exe
....\....\...\.....\Tank.Form1.resources
....\....\...\.....\Tank.pdb
....\....\...\.....\Tank.Properties.Resources.resources
....\....\Program.cs
....\....\...perties\AssemblyInfo.cs
....\....\..........\Resources.Designer.cs
....\....\..........\Resources.resx
....\....\..........\Settings.Designer.cs
....\....\..........\Settings.settings
....\....\Resources\TankD.bmp
....\....\.........\TankL.bmp
....\....\.........\TankR.bmp
....\....\.........\TankU.bmp
....\....\Tank.csproj
....\....\Tank.csproj.user
....\Tank.sln
....\Tank.suo
....\....\obj\Debug\Refactor
....\....\...\.....\TempPE
....\....\bin\Debug
....\....\obj\Debug
....\....\bin
....\....\obj
....\....\Properties
....\....\Resources
....\Tank
Tank

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