一般

DataTable dt = new DataTable("Users");
            dt.Columns.Add("PK", typeof(int));
            dt.Columns.Add("#", typeof(int));

 

row1["Popularity"]=0;
            dt.Rows.Add(row1);

 

 

ublic static Color[] colors=new Color[]{Color.White, Color.SandyBrown,
            Color.LightGray, Color.Gold, Color.LightBlue};

 

 

//临时文件

System.Environment.GetEnvironmentVariable( "TEMP ");

 

string windowsTempPath = Path.GetTempPath();
string randomFileName = Path.GetRandomFileName();
using System.IO;
 
public class TempFile : IDisposable
{
    private readonly string _tmpfile;
    public TempFile()
        : this(string.Empty)
    { }
    public TempFile(string extension)
    {
        _tmpfile = Path.GetTempFileName();
        if (!string.IsNullOrEmpty(extension))
        {
            string newTmpFile = _tmpfile + extension;
            // create tmp-File with new extension ...
            File.Create(newTmpFile, 0);
            // delete old tmp-File
            File.Delete(_tmpfile);
            // use new tmp-File
            _tmpfile = newTmpFile;
        }
    }
    public string FullPath
    {
        get { return _tmpfile; }
    }
    void IDisposable.Dispose()
    {
        if (!string.IsNullOrEmpty(_tmpfile) && File.Exists(_tmpfile))
            File.Delete(_tmpfile);
    }
}
//Example Use
using(TempFile tmp = new TempFile(".png"))
{
     string filename = tmp.FullPath;
     // use the file
}