C# how to achieve data drag? (Drag the picture to the TextBox and display it)

Picture2Game\Form1.cs
............\Form1.Designer.cs
............\Form1.resx
............\image\1-3章.jpg
............\.....\10章续.jpg
............\.....\11-13章.jpg
............\.....\11章续.jpg
............\.....\14-17章.jpg
............\.....\17前加入的伙伴.jpg
............\.....\17章续.jpg
............\.....\18-19章.jpg
............\.....\2.jpg
............\.....\20-21章.jpg
............\.....\22-23章.jpg
............\.....\4-7章.jpg
............\.....\8-10章.jpg
............\.....\8章续.jpg
............\.....\前篇技巧1.jpg
............\.....\前篇技巧2.jpg
............\.....\应用技巧篇.jpg
............\.....\最终章.jpg
............\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache
............\...\...\.....\GenerateResource-ResGen.read.1.tlog
............\...\...\.....\GenerateResource-ResGen.write.1.tlog
............\...\...\.....\Picture2Game.csproj.FileListAbsolute.txt
............\...\...\.....\Picture2Game.exe
............\...\...\.....\Picture2Game.Form1.resources
............\...\...\.....\Picture2Game.pdb
............\...\...\.....\Picture2Game.Properties.Resources.resources
............\...\...\.....\TempPE\Properties.Resources.Designer.cs.dll
............\OperateClass.cs
............\Picture2Game.csproj
............\Picture2Game.csproj.user
............\Program.cs
............\...perties\AssemblyInfo.cs
............\..........\Resources.Designer.cs
............\..........\Resources.resx
............\..........\Settings.Designer.cs
............\..........\Settings.settings
............\xd.ico
Picture2Game.sln
............\obj\x86\Debug\TempPE
............\...\...\Debug
............\...\x86
............\image
............\obj
............\Properties
Picture2Game
《新·纹章之谜~光与影的英雄》图文攻略.exe

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