C# Export DataGridView

You can also surely cast the the DataSource property of the grid into a datatable and use this trick: http://emoreau.com/Entries/Articles/2009/04/Using-LINQ-and-XML-Literals-to-transform-a-DataTable-into-a-HTML-table.aspx

Try this:

var sb = new StringBuilder();

var headers = dataGridView1.Columns.Cast<DataGridViewColumn>();
sb.AppendLine(string.Join(",", headers.Select(column => "\"" + column.HeaderText + "\"").ToArray()));

foreach (DataGridViewRow row in dataGridView1.Rows)
{
    var cells = row.Cells.Cast<DataGridViewCell>();
    sb.AppendLine(string.Join(",", cells.Select(cell => "\"" + cell.Value + "\"").ToArray()));
}
System.IO.StreamWriter file = new System.IO.StreamWriter(@"\YourFile.csv");
file.WriteLine(sb.ToString());

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Thank you, it works, others advises is fine, but about coma separated and my particular need was tab delimited file.