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C#: Import Excel and CSV file into DataTable using C#

It's one of the main hurdles any developer will face during development life cycle. We have Excel sheet or CSV sheet and client want to save data of Excel/CSV file to be saved in database with the help of C# coding.
Here I'll explain how we can import Excel and CSV file and then create data-table of file records. We can then easily use this data-table to insert record in DB (here I'm not explaining how to insert record to DB).

Here is function to import excel file and return DataTable:

Namespace required are: System.Data and System.Data.OleDb;

private DataTable GetExcelSheetdata()
    DataTable dt = new DataTable();

        // Url of file to be imported.
        var url = @"c:\test.xls";

        // Create OleDB connection string.
        string connectionString = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 12.0;""", url);

        var query = String.Format("Select * from [{0}$]", "Sheet1");
        //Creates and fill Oledb data adapter.
        OleDbDataAdapter dataAdapter = new OleDbDataAdapter(query, connectionString);

        //create and fill dataset from adapter      
        DataSet dataSet = new DataSet();

        dt = dataSet.Tables[0];
    return dt;

And if we want to import .csv file, then here is the code to import file and return DataTable:

Namespace required are: System.Data and System.Data.Odbc;

private DataTable GetCsvSpreadSheetdata()
    DataTable dt = new DataTable();

        // Directory and file to be imported.
        var serverDirPath = @"c:\";
        var fileName = "test.csv";
        var filePath = string.Concat(serverDirPath, "\\", fileName);

        var strConnString = "Driver={Microsoft Text Driver (*.txt; *.csv)};Dbq="
                + serverDirPath + ";Extensions=asc,csv,tab,txt;Persist Security Info=False";

        // Creates and opens an ODBC connection
        OdbcConnection conn = new OdbcConnection(strConnString.Trim());

        var query = string.Format("Select * from [{0}]", fileName);

        //Creates the data adapter
        OdbcDataAdapter obj_da = new OdbcDataAdapter(query, conn);

        DataSet ds = new DataSet();

        //Fill dataset with the records from CSV file
        obj_da.Fill(ds, "members");

        //closes the connection

        dt = ds.Tables[0];

    return dt;

User can easily iterate over returned DataTable to save the record in DB.

Happy Coding!!!

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