whats the correct way to cache a object(DataSet) and then get it and when it expires repopulate it with out a major hiccup in the application... the application relies on this data to be there for read only purposes. ...
I have 2 queries. One is populating a dataset that populates the dropdownlist and the other populates rest of the textboxes of a table row. i want to know how can i fill the entire dropdownlist and then make selectedvalue the value from the other query? e.g - dataset query = select hobby from hobbies other query - select name, dob, add...
Just take any dataset and convert the dataset into matrix. And convert the matrix into array formate in vb.net ...
Hi All; DataSet ds = GetExcelToXml("test.xls"); string filename = "C:\\test.xml"; FileStream myFileStream = new FileStream(filename, FileMode.Create); XmlTextWriter myXmlWriter = new XmlTextWriter(myFileStream, Encoding.Default); ds.WriteXml(myXmlWriter); myXmlWriter.Close(); Output Xml <NewDataSet> <Table> <UserName>bla...
Im trying to add data in a dataset into a List. This is my function in C# public List<ProductsDAL> GetAllProducts(string sqlQuery) { DataSet dsinsert = GetDataSet(sqlQuery, "tblProducts"); List<ProductsDAL> bPList = new List<ProductsDAL>(); ProductsDALforeach (DataRow item in dsinsert.Tables[0].Rows) { this.Pro...
Scenario I have a DevExpress DataGrid which is bound to a DataSet in C#. I want to populate each dataset row to contain a string in the first column and a checkbox in the second. My code below doesn't work quite how I want it to, and I'm not sure why..... The Code As you can see I've declared a dataset, but when I try and pass in a ne...
I'm generating some code from a form object using reflection. I want to iterate through all the controls on the form and output the field and table that each control is bound to. Right now, I am able to output the databound field for a control: if ((control is Label) || (control is TextBox)) { if (control.DataBindings["Text"] != nu...
(This is a database / R commands question) I wish (for my thesis work), to import tRNA data into R and have it aligned. My questions are: 1) What resources can I use for the data. 2) What commands might help me with the import/alignment. So far, I found two nice repositories that holds such data: tRNAdb at the University of Leipzig ...
I've got multiple massive (multi gigabyte) datasets I need to import into a Rails app. The datasets are currently each in their own database on my development machine, and I need to read from them and create rows in tables in my Rails database based on the information they contain. The tables in my Rails database will not be exactly th...
I've got some legacy dataset code which I'm updating. I'm attempting to determine if the dataset has changes to it so I can properly prompt for a save request. However myDataset.HasChanges() always returns true. In my save method I've edited the code to determine when the dataset get's changes and made the code like this: 1. myBindingS...
I have a tab-separated data file with a little over 2 million lines and 19 columns. You can find it, in US.zip: http://download.geonames.org/export/dump/. I started to run the following but with for l in f.readlines(). I understand that just iterating over the file is supposed to be more efficient so I'm posting that below. Still, wit...
Here's the problem: my input is XML file that looks something like: <BaseEntityClassInfo> <item> <key>BaseEntityClassInfo.SomeField</key> <value>valueData1</value> </item> <item> <key>BaseEntityClassInfo.AdditionalDataClass.SomeOtherField</key> <value>valueData2</value> </item> <item> <key>BaseEntityClassInfo.AdditionalDataCla...
I've been working for quite a while now with LINQ. However, it remains a bit of a mystery what the real differences are between the mentioned flavours of LINQ. The successful answer will contain a short differentiation between them. What is the main goal of each flavor, what is the benefit, and is there a performance impact... P.S. I ...
Please help me as I am a newbie using VB.NET. I have been asked to transfer rows from a DataReader into a Crystal Report dataset. Here are the coding: Private Sub BtnTransfer() dim strsql as string = "Select OrderID, OrderDate from ORDERS" dim DS as new dataset1 '<---crysal report dataset1.xsd dim DR as SqlDataReader dim ...
Hye Guys, for those regularly browsing this site sorry for already another question (however I did solve my last question myself!) I have another problem with merging datasets, it seems that accounting for time in datasets is a real pain in the ass. I succesfully managed to merge on months in my previous datasets, however it seems I ha...
I'm writing a small app to do a little processing on some cells in a CSV file I have. I've figured out how to read and write CSV files with a library I found online, but I'm having trouble: the library parses CSV files into a DataTable, but, when I try to change a cell of the table, it isn't saving the change in the table! Below is the ...
I'm a beginning programmer in the relevant areas to this question, so if possible, it'd be helpful to avoid assuming I know a lot already. I'm trying to import the OpenLibrary dataset into a local Postgres database. After it's imported, I plan to use it as a starting seed for a Ruby on Rails application that will include information on ...
When the user clicks an "Edit" button on my form, I want a box to come up which allows the user to edit a DataTable in a strongly-typed DataSet. What's the best way to do this? ...
What's the syntax for an Update query for a table without a primary key? Disclaimer: Frustratingly, adding a primary key is not an option. My program is a small program in a much larger system with poor data management. My development time does not include rewriting the other software. Note: The database is Microsoft Access. Note: S...
I have an Excel spreadsheet that will sit out on a network share drive. It needs to be accessed by my Winforms C# 3.0 application (many users could be using the app and hitting this spreadsheet at the same time). There is a lot of data on one worksheet. This data is broken out into areas that I have named as ranges. I need to be able...