C# - How to use DataTable on System.Data Assembly?

I have an error when using the System.Data namespace, I'm trying to read a CSV file into a DataTable object.

using System;
using System.Data;

class MainClass {
  public static void Main (string[] args) {
    
    DataTable exampleData = new DataTable();
    exampleData = ConvertToDataTable("./example.csv", 2);


    foreach (DataRow dataRow in exampleData.Rows)
    {
      foreach (var item in dataRow.ItemArray)
      {
        Console.WriteLine(item);
      }
    }
  }

  public DataTable ConvertToDataTable (string filePath, int numberOfColumns)
  { ... }
}

main.cs(2,14): error CS0234: The type or namespace name Data' >does not exist in the namespaceSystem'. Are you missing >`System.Data' assembly reference?

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