How to export DataTable to Excel

Question

How can I export a DataTable to Excel in C#? I am using Windows Forms. The DataTable is associated with a DataGridView control. I have

Answer 1

Try simple code, to convert DataTable to excel file as csv:

var lines = new List();

string[] columnNames = dataTable.Columns
    .Cast()
    .Select(column => column.ColumnName)
    .ToArray();

var header = string.Join(",", columnNames.Select(name => $"\"{name}\""));
lines.Add(header);

var valueLines = dataTable.AsEnumerable()
    .Select(row => string.Join(",", row.ItemArray.Select(val => $"\"{val}\"")));

lines.AddRange(valueLines);

File.WriteAllLines("excel.csv", lines);

This will write a new file excel.csv into the current working directory which is generally either where the .exe is or where you launch it from.