2011年5月20日 · Here, give this a shot (this is just a pseudocode) using System; using System.Data; using System.Data.SqlClient; public class PullDataTest { // your data table private DataTable dataTable = new DataTable(); // your method to pull data from database to datatable public void PullData() { string connString = @"your connection string here"; string query = "select * from table"; SqlConnection conn ...

2009年10月19日 · The DataTable offers random row access to its Rows collection, not only through typical collections behavior, but also through DataTable.Select. However I cannot seem to be able to tie this ability to DataRow.Delete. So far this is what it seems I need to do in order to conditionally delete one or more rows from a table.

Process: DataSet/DataTable (Serialize) ==> Json (Deserialize) ==> Target Object List In this example as the OP, simply do: string serializeddt = JsonConvert.SerializeObject(dt, Formatting.Indented); Now the DataTable is serialized into a plain string. Then do this:

2011年11月21日 · How can I export a DataTable to Excel in C#? I am using Windows Forms. The DataTable is associated with a DataGridView control. I have to export records of DataTable to Excel.

As you create new DataTable object, there seems no need to Clear DataTable in very next statement. You can also use DataTable.Columns.AddRange to add columns with on statement. Complete code would be. DataTable dt = new DataTable(); dt.Columns.AddRange(new DataColumn[] { new DataColumn("Name"), new DataColumn("Marks") }); dt.Rows.Add("Ravi ...

Here is an example of adding a new row to a datatable that uses AutoIncrement on the first column: Define the table structure: Dim dt As New DataTable dt.Columns.Add("ID") dt.Columns.Add("Name") dt.Columns(0).AutoIncrement = True Add a New row:

I'm used to work with Java where large amounts of examples are available. For various reasons I had to switch to C# and trying to do the following in SharpDevelop: // Form has a menu containing a

Here's how I do it using a DataTable. This is a working piece of TEST code. using (SqlConnection con = new SqlConnection(connStr)) { con.Open(); // Create a table with some rows. DataTable table = MakeTable(); // Get a reference to a single row in the table.

2013年10月1日 · //Then, once the datatable is functional, do the following to bind it to the DGV. NOTE: the DGV's AutoGenerateColumns property must be 'true' for this example, or the "assigning" of column names from datatable to dgv will not work. I also "added" my datatable to a dataset previously, but I don't think that is necessary.

DataTable.Rows returns a DataRowCollection which only implements IEnumerable, not IEnumerable<DataRow>. Use the AsEnumerable() extension method on DataTable (from DataTableExtensions ) instead: Parallel.ForEach(dt.AsEnumerable(), drow => { ...