Bulk Insert data into Database using C#

// Get the DataTable 
DataTable dt = new DataTable();
dt.column.add("id", typeof(int));
dt.column.add("fname", typeof(string));
dt.column.add("lname", typeof(string));
for (int = 0; i < 4; i++)
{
    dt.Rows.Add(1, "shivu", "Nagarabetta");
}

DataTable dtInsertRows = dt;
//dtInsertRows.Columns.Remove("itemid");

using (SqlBulkCopy sbc = new SqlBulkCopy(connectionstring))
{
    sbc.DestinationTableName = "tablename";
    // Number of records to be processed in one go
    sbc.BatchSize = 2;
    // Map the Source Column from DataTabel to the Destination Columns in SQL Server 2005 Person Table
    sbc.ColumnMappings.Add("id", "id");
    sbc.ColumnMappings.Add("fname", "fname");

    sbc.ColumnMappings.Add("lname", "lname");

    // Number of records after which client has to be notified about its status
    sbc.NotifyAfter = dtInsertRows.Rows.Count;
    // Event that gets fired when NotifyAfter number of records are processed.
    sbc.SqlRowsCopied += new SqlRowsCopiedEventHandler(sbc_SqlRowsCopied);
    // Finally write to server
    sbc.WriteToServer(dtInsertRows);
    sbc.Close();
}