C# delete a folder and all files and folders within that folder

I'm trying to delete a folder and all files and folders within that folder, I'm using the code below and I get the error Folder is not empty, any suggestions on what I can do?

try
{
var dir = new DirectoryInfo(@FolderPath);
dir.Attributes = dir.Attributes & ~FileAttributes.ReadOnly;
dir.Delete();
dataGridView1.Rows.RemoveAt(dataGridView1.SelectedRows[i].Index);
}
catch (IOException ex)
{
MessageBox.Show(ex.Message);
}
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Read the Manual:

Directory.Delete Method (String, Boolean)

Directory.Delete(folderPath, true);
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最佳答案 
dir.Delete(true); // true => recursive delete
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The Directory.Delete method has a recursive boolean parameter, it should do what you need

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Err, what about just calling Directory.Delete(path, true); ?

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Try: 

System.IO.Directory.Delete(path,true)

This will recursively delete all files and folders underneath "path" assuming you have the permissions to do so.

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You should use:

dir.Delete(true);

for recursively deleting the contents of that folder too. See MSDN DirectoryInfo.Delete() overloads.

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Try this.

namespace EraseJunkFiles
{
class Program
{
static void Main(string[] args)
{
DirectoryInfo yourRootDir = new DirectoryInfo(@"C:\somedirectory\");
foreach (DirectoryInfo dir in yourRootDir.GetDirectories())
DeleteDirectory(dir.FullName, true);
}
public static void DeleteDirectory(string directoryName, bool checkDirectiryExist)
{
if (Directory.Exists(directoryName))
Directory.Delete(directoryName, true);
else if (checkDirectiryExist)
throw new SystemException("Directory you want to delete is not exist");
}
}
}
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For those of you running into the DirectoryNotFoundException, add this check:

if (Directory.Exists(path)) Directory.Delete(path, true);

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