C#的winform项目怎么将计算的结果保存到电脑本地的txt文件

C:\Users\1234aqz\source\repos\WindowsFormsApp7\WindowsFormsApp7\bin\Debug\WindowsFormsApp7.exe.config C:\Users\1234aqz\source\repos\WindowsFormsApp7\WindowsFormsApp7\bin\Debug\WindowsFormsApp7.exe C:\Users\1234aqz\source\repos\WindowsFormsApp7\WindowsFormsApp7\bin\Debug\WindowsFormsApp7.pdb C:\Users\1234aqz\source\repos\WindowsFormsApp7\WindowsFormsApp7\obj\Debug\WindowsFormsApp7.csprojAssemblyReference.cache C:\Users\1234aqz\source\repos\WindowsFormsApp7\WindowsFormsApp7\obj\Debug\WindowsFormsApp7.Form1.resources C:\Users\1234aqz\source\repos\WindowsFormsApp7\WindowsFormsApp7\obj\Debug\WindowsFormsApp7.Properties.Resources.resources C:\Users\1234aqz\source\repos\WindowsFormsApp7\WindowsFormsApp7\obj\Debug\WindowsFormsApp7.csproj.GenerateResource.cache C:\Users\1234aqz\source\repos\WindowsFormsApp7\WindowsFormsApp7\obj\Debug\WindowsFormsApp7.csproj.CoreCompileInputs.cache C:\Users\1234aqz\source\repos\WindowsFormsApp7\WindowsFormsApp7\obj\Debug\WindowsFormsApp7.exe C:\Users\1234aqz\source\repos\WindowsFormsApp7\WindowsFormsApp7\obj\Debug\WindowsFormsApp7.pdb