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C # How to export data from a dataset to an Excel file

[Size = x-large] using system; Using system. Collections. Generic; Using system. text; Using system. Data; Using system. Windows. forms; Using system. reflection; Namespace DMS{/// /// C # Excel operations/// Class exceloperate{// Method 1 // Public bool datasettoexcel (Dataset dataset, bool isshowexcle)//{// Datatable = dataset. Tables [0];// Int rownumber = d

HTML5 custom Property Objects DataSet Introduction

HTML5 Description of custom attributesThe "28 HTML5 features, tricks and techniques you must know" article in the previous translation of the custom legal attributes in HTML5 data- has been introduced, that is, in HTML5 we can use data- the prefix to set the custom properties we need to do some data storage, For example, we want to store the corresponding ID on a text button:TestThe data- prefix is called data属性 , which can be defined by a script, or the CSS property selector can be applied to s

Dataset readxml readxmlschema (from msdn)

Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->private void DemonstrateReadWriteXMLDocumentWithStreamReader(){// Create a DataSet with one table and two columns. DataSet OriginalDataSet = new DataSet("dataSet"); OriginalDataSet.Namespace= "NetFrameWork";

C # XML Code List (read XML, write XML, update, delete nodes, and combine with dataset) page 1/2

: xmlnodelist xnl = xmldoc. selectsinglenode ("Bookstore"). childnodes; Foreach (xmlnode Xn in xnl){Xmlelement Xe = (xmlelement) xn;If (Xe. getattribute ("genre") = "Fantasy "){Xe. removeattribute ("genre"); // Delete genre attributes}Else if (Xe. getattribute ("genre") = "Update lizanhong "){Xe. removeall (); // delete all content of the node}}Xmldoc. Save ("Bookstore. xml "); The final result is:Corets, Eva5.954. display all data. Copy code The Code is as follows: xmlnode xn = xmldoc.

[Ado. Net] offline data processing-DataSet object

1. Dataset ObjectL And sqldatareader Object comparisonSqldatareader is a fast and efficient structure for obtaining query results. It only supports Reading query results one way forward and the data is read-only. Dataset allows you to view query results cyclically and cyclically, and supports sorting, searching, and caching and modifying data. L DataSet object me

LINQ to dataset study Note 1

LINQ to Dataset In addition. net integration, through ADO. net to obtain data, and then query the data through LINQ, so as to implement complex query of the Data. To be understood as querying the data saved in dataset through LINQ, generally, den provides the following steps: 1.Obtain the dataset or datatable Data Source, LINQ to

With a DataReader or a dataset?

I often hear people ask this question: "Should I use a DataReader class or a DataSet class in a ASP.net Web application?" "I often see this misconception in many articles and newsgroup postings that DataReader (SqlDataReader or OleDbDataReader abbreviations) are better than datasets. Sometimes I also see the opposite story. In fact, Microsoft created the two data access classes because they were all we needed. Each class has its advantages and disadva

Examples of adding datasets, rows, columns, primary keys, and foreign keys to dataset)

. eventhandler (this. button#click );This. btnaddforeign. Click + = new system. eventhandler (this. btnaddforeign_click );This. btnupdatemid. Click + = new system. eventhandler (this. btnupdatemid_click );This. button2.click + = new system. eventhandler (this. button2_click );This. btnupdateds. Click + = new system. eventhandler (this. btnupdateds_click );This. Load + = new system. eventhandler (this. page_load ); } private void btncreate_click (Object sender, system. eventargs e) { datatable d

Lesson 2 (1) define a multi-dimensional dataset

using the multi-dimensional dataset wizard, you can easily define a simple multi-dimensional dataset in SQL Server 2005. This wizard helps you define measurement values and dimensions for cubes. In this wizard, you can define a multi-dimensional dataset based on the data source, or you can define a multi-dimensional dataset

Research on the Merge method of DataSet

In Ado.net, when we merge two identical or similar dataset objects, we usually use the dataset's Merge method, which has multiple overloaded versions, and we review the merge method before introducing it, and here's how to use the Merge method in MSDN: The merge method is used to consolidate two DataSet objects that are roughly similar to the schema. Merging on a client application is typically used to m

The concept of a vb.net dataset (datasets)

1. Basic Concepts A DataSet is an off-line cache-storing data that, like a database, has a hierarchy of tables, rows, columns, and also includes constraints and associations between data defined for a dataset. The user can pass. NET Framework's namespace (NameSpace) to create and manipulate datasets. Users can understand the concept of a dataset through the co

Difference between datareader and Dataset

Explanation 1 Datareader And Dataset The biggest difference is that , Datareader Always in use Sqlconnection (commonly known as non-disconnected connection ), When you operate databases online, Any pair Sqlconnection Will cause Datareader Exception . Because Datareader Load only one piece of data in the memory at a time , Therefore, the occupied memory is very small. Because Datareader Special and high performance, So Datareader

Preliminary database operations in ASP. NET (2) --- dataset database operations

We have already discussed how to operate databases, but almost all of them are done through oledbcommand and oledbdatareader. This time we will talk about how to operate databases through oledbdataadapter! We have already discussed the use of oledbdataadapter before. Because oledbdataadapter is a bridge between dataset and the data source, dataset is used to store, remotely process, and program single-layer

Methods for filling dataset Datasets

Next, I sent something I wrote, Which is intermittent. I hope it will help you! After creatingDatasetAfter the object, the following thing isDatasetFill data in a dataset. Currently, the most common data filling method is used in combination with databases.DataadapterObject FillingDataset. This method is introduced in this section, and the other two methods are introduced. Detailed explanation 1.Pass the data in the databaseDataadapterObject Fill

Crystalreportviewer + receivecrystalreport. rpt + dataset. XSD

Crystalreportviewer + receivecrystalreport. Rpt (report file) + dataset. XSD (Dataset) 1. The reportsource attribute of crystalreportviewer specifies a receivecrystalreport. rpt file2. Add a dataset. XSD file and add the field information to be displayed in the report (must be consistent with that in the database)3. Open the receivecrystalreport. rpt file, right-

Use objectdatasource in Oracle to read a strongly-Typed Dataset

This blog post mainly describes how to use objectdatasource to read data in the. XSD dataset file, The only difference from the past is that these data tables come from the oralce database, not the SQL Server database, If you want to operate the Oracle database in Visual Studio and design the dataset. XSD in a visualized manner, You must follow ODT. net, which is a plug-in developed by Oracle for Visu

LINQ to dataset Overview

ArticleDirectory LINQ to dataset Overview Query untyped Dataset Query Typed Dataset Relation in query Dataset LINQ to dataset Overview Relatively speaking, LINQ to dataset is the smallest piece in The LINQ t

Benefits of using Dataset

It is very convenient to use dataset in many cases. The following are some advantages of using Dataset: 1. It is easy to bind with the UI control. Although you can implement some interfaces (ilist, ilistsource, ibindinglist, and so on) for custom business objects to bind them to controls, it is quite troublesome after all, it is very convenient to use dataset

C # XML Operation code Encyclopedia (read XML, write XML, update, delete node, combine with DataSet, etc.) 1th/2 page _ Practical Tips

dataset (source code) Copy Code code as follows: Using System; Using System.Data; Using System.Xml; Using System.Windows.Forms; //*************************************** The writer: go begging tomorrow qicq:305725744 // . NET group: 6370988 Http://blog.csdn.net/kgdiwss //*************************************** Namespace Ystrp.common { /// Summary description of the Operatexmlbydataset. /// public class Operatexmlbyda

The difference and usage of C # DataSet and DataTable

A DataSet is a DataSet, aDataTable is a data table, and a dataset stores multiple DataTable. Datasets and DataTable are like a container for storing data, which can exist when you query the database for some results.The DataSet is powerful for browsing, sorting, searching, filtering, processing hierarchical data, cachi

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