how generate data 500MB more second file generate in C# using data tab

You will need to serialize the DataTable into a file and check the file size as you write. If it exceeds 500 MB, you should close the current file and start a new one. Also you can use a StreamWriter to write to files. Keep track of the file size and create new files as needed.

using System;
using System.Data;
using System.IO;
using System.Text;

class Program
{
    static void Main()
    {
        // Your DataTable with data
        DataTable dataTable = GetYourDataTable();

        // Directory to save files
        string directoryPath = @"C:\YourDirectoryPath\";
        string fileNamePrefix = "DataFile";
        int maxFileSizeInMB = 500;
        int maxFileSizeInBytes = maxFileSizeInMB * 1024 * 1024;

        int fileCounter = 1;
        string currentFileName = Path.Combine(directoryPath, $"{fileNamePrefix}_{fileCounter}.txt");

        using (StreamWriter writer = new StreamWriter(currentFileName, false, Encoding.UTF8))
        {
            foreach (DataRow row in dataTable.Rows)
            {
                StringBuilder line = new StringBuilder();

                // Convert the row to a string (you can customize the format)
                for (int i = 0; i < dataTable.Columns.Count; i++)
                {
                    line.Append(row[i].ToString());
                    if (i < dataTable.Columns.Count - 1)
                        line.Append(",");
                }

                writer.WriteLine(line.ToString());

                // Check the file size
                FileInfo fileInfo = new FileInfo(currentFileName);
                if (fileInfo.Length > maxFileSizeInBytes)
                {
                    writer.Flush();
                    writer.Close();

                    // Create a new file
                    fileCounter++;
                    currentFileName = Path.Combine(directoryPath, $"{fileNamePrefix}_{fileCounter}.txt");
                    writer = new StreamWriter(currentFileName, false, Encoding.UTF8);
                }
            }
        }

        Console.WriteLine("Files generated successfully.");
    }

    static DataTable GetYourDataTable()
    {
        // Create and populate your DataTable here
        DataTable dt = new DataTable();
        dt.Columns.Add("Column1");
        dt.Columns.Add("Column2");
        dt.Columns.Add("Column3");

        for (int i = 0; i < 1000000; i++)
        {
            dt.Rows.Add("Data1_" + i, "Data2_" + i, "Data3_" + i);
        }

        return dt;
    }
}