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Datatable vs Dataset


By : Mansur
Date : July 28 2020, 09:00 PM
To fix this issue 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 .NET construct. At least, that's been my experience.
code :


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C#/DataSet: Create and bind a custom column/property in a DataSet`s DataTable in the XXXDataSet.cs


By : vini
Date : March 29 2020, 07:55 AM
wish helps you It is not possible to create a custom property in a typed row class and use it with databinding.
You could try implementing IListSource, IBindingList, and ITypedList yourself, and returning the PropertyDescriptor, but it will involve a horrifying amount of work.

Trying to add rows to a datatable within a dataset but editor doesn't "see" my dataset/datatable?


By : Apoorna
Date : March 29 2020, 07:55 AM
I hope this helps . have you declared an instance of the dataset? just creating the dataset in the editor is not enough. basically all you have done is designed what the dataset "looks" like. the tables and the columns in those tables, along with the data type (and other assorted properties) of each column.
typically, you create an instance of your (typed) dataset somewhere in your code...
code :
MyDataSet ds = new MyDataSet();
DataTable1.Rows.Add("Mark","123 Anystreet","555-512-2333","mark@bazinga.com")

Removing from temporary DataTable if ID meets DataSet.DataTable value


By : Lisa Cheok
Date : March 29 2020, 07:55 AM
I wish this helpful for you Not sure if I have understood correctly, but to remove elements from the temp table you could apply the Select method, then call Delete for the found rows and finally call AcceptChanges to effectively remove the rows
code :
   foreach (DataRow r in myDataSet.tbl_reservation.Rows)
   {
        int rID = (int)r["tableID"];

        // Find all the rows with the desidered tableID in temp_table
        DataRow[] toRemove = tmp_table.Select("tableID=" + rID.ToString());
        foreach(DataRow r in toRemove)
            r.Delete();  // Delete doesn't try to remove the row, just marks it as deleted
   }
   // All the rows marked as deleted are effectively removed from the table rows collection
   tmp_table.AcceptChanges();

Adding datatable to dataset creates 2 identical tables in dataset, is there another way to add?


By : user3100692
Date : March 29 2020, 07:55 AM
will help you When you create a DataSet with the DataSetGenerator, the tables you specify are automatically created when the DataSet is created. You don't have to add a new table, just access the one it already has.
code :
private string getStorageKey(string strStorageAccount)
    {
        DataSetStorageKeyDetails ds = new DataSetStorageKeyDetails();
        string strStorageKey = "";

        ds.StorageKeyDetails.Rows.Add(strStorageAccount);

        DataSet dsOut = ServiceEnclosed.InterfaceService("GetStorageKey", ds);

        DataTable dtr = dsOut.Tables[0];
        strStorageKey = ds.StorageKeyDetails.Rows[0].StorageName;            

        return strStorageKey;
    }

Fetch distinct record from dataset/table using linq to dataset/datatable


By : maulik
Date : March 29 2020, 07:55 AM
I hope this helps . I am fetching record from database and store a result in dataset. , I'm confused with the question but is this want you want?
code :
yourDatatable.Rows.Cast<DataRow>()
.GroupBy(r => new { Sid = r.Field<int>("Sid"), userid = r.Field<int>("userid"), Table = r.Field<string>("Table") })
.Select(e => e.FirstOrDefault())
.Select(grp => new
{
    Sid = grp.Field<int>("Sid"),
    userid = grp.Field<int>("userid"),
    Table = grp.Field<string>("Table"),
    par1 = grp.Field<int>("par1"),
    par2 = grp.Field<int>("par2"),
    par3 = grp.Field<int>("par3")
});
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