Importing excel data to the dataset tables C#

Question

How to import data from excel sheet to dataset in the following code because when I do not name the sheet name to be 'Cost', the dataset displays null. Otherwise, it is ok. I should not put dataSet.Tables["Cost"] cost on this. How to get data from sheet of any name? Thank you in advance.

     void ImportData(string fileName)
    {
        //Parsing excel file data
        var dataSet = Common.ParseExcelFile(fileName);

        var cost = dataSet.Tables["Cost"];
        if (cost != null && cost.Rows.Count > 0 )
        {
            BulkInsertCost(cost);
        }
    }

Answer 1

DataSet's Tables property has a numeric indexer as well which you can use to access the tables without knowing their names. eg:

var cost = dataSet.Tables[0];