You cannot change the DataType after the Datatable is filled with data. However, you can clone the Data table, change the column type and load data from previous data table to the cloned table as shown below. DataTable dtCloned = dt.Clone(); dtCloned.Columns[0].DataType = typeof(Int32); foreach (DataRow row in dt.Rows) { dtCloned.ImportRow(row); }
Remember to add MatTableModule in your app.module’s imports i.e. In Angular 9+ import { MatTableModule } from ‘@angular/material/table’ @NgModule({ imports: [ // … MatTableModule // … ] }) Less than Angular 9 import { MatTableModule } from ‘@angular/material’ @NgModule({ imports: [ // … MatTableModule // … ] })
It really depends on the sort of data you’re bringing back. Since a DataSet is (in effect) just a collection of DataTable objects, you can return multiple distinct sets of data into a single, and therefore more manageable, object. Performance-wise, you’re more likely to get inefficiency from unoptimized queries than from the “wrong” choice of … Read more
Take a look at the CHECKSUM command: SELECT CHECKSUM_AGG(BINARY_CHECKSUM(*)) FROM sample_table WITH (NOLOCK); That will return the same number each time it’s run as long as the table contents haven’t changed. See my post on this for more information: CHECKSUM Here’s how I used it to rebuild cache dependencies when tables changed: ASP.NET 1.1 database … Read more
You can find more information directly on this link: http://datatables.net/examples/basic_init/filter_only.html $(document).ready(function() { $(‘#example’).dataTable({ “bPaginate”: false, “bLengthChange”: false, “bFilter”: true, “bInfo”: false, “bAutoWidth”: false }); }); Hope that helps ! EDIT : If you are lazy, “bLengthChange”: false, is the one you need to change 🙂
I’m afraid you can’t easily do an in-place sort of a DataTable like it sounds like you want to do. What you can do is create a new DataTable from a DataView that you create from your original DataTable. Apply whatever sorts and/or filters you want on the DataView and then create a new DataTable … Read more
foreach (DataRow dr in dataTable1.Rows) { if (/* some condition */) dataTable2.Rows.Add(dr.ItemArray); } The above example assumes that dataTable1 and dataTable2 have the same number, type and order of columns.
DataView view = new DataView(table); DataTable distinctValues = view.ToTable(true, “Column1”, “Column2” …);
I have been using OleDb provider. However, it has problems if you are reading in rows that have numeric values but you want them treated as text. However, you can get around that issue by creating a schema.ini file. Here is my method I used: // using System.Data; // using System.Data.OleDb; // using System.Globalization; // … Read more
If you’re using .NET 3.5, you can use DataTableExtensions.AsEnumerable (an extension method) and then if you really need a List<DataRow> instead of just IEnumerable<DataRow> you can call Enumerable.ToList: IEnumerable<DataRow> sequence = dt.AsEnumerable(); or using System.Linq; … List<DataRow> list = dt.AsEnumerable().ToList();