How to load data from DataReader to DataTable?

How to load data from DataReader to DataTable?

Load() and the second one, by manually converting a DataReader to a DataTable. Step 1: Create a new ASP.NET application. Drag and drop two GridView controls to the page. We will fetch data from a DataReader into a DataTable and bind the DataTable to the GridView’s.

How to fill DataSet with DataReader?

Converting DataReader to DataSet using C# and VB.Net The records from the Customers table are fetched using SqlDataReader. Then a new DataSet is created and a DataTable is added to the DataSet. Finally the DataReader records are loaded into the DataTable of the DataSet using its Load method.

How to read data from DataReader to DataTable in c#?

Convert data reader to data table

1. object[] ColArray = new object[rdr.FieldCount];
2. for (int i = 0; i < rdr.FieldCount; i++)
3. {
4. if (rdr[i] != null) ColArray[i] = rdr[i];
5. }
6. dtData.LoadDataRow(ColArray, true);

Which is faster DataReader or DataTable?

We ended up writing some benchmarks to test the speed differences. It was generally agreed that a DataReader is faster, but we wanted to see how much faster. The results surprised us. The DataTable was consistently faster than the DataReader.

What is a DataReader object?

In ADO.NET, a DataReader is a broad category of objects used to sequentially read data from a data source. A DataReader is usually accompanied by a Command object that contains the query, optionally any parameters, and the connection object to run the query on.

Is DataReader faster than DataTable?

It was generally agreed that a DataReader is faster, but we wanted to see how much faster. The results surprised us. The DataTable was consistently faster than the DataReader. Approaching twice as fast sometimes.

How can I create multiple tables in DataSet?

9 Answers. Filling a DataSet with multiple tables can be done by sending multiple requests to the database, or in a faster way: Multiple SELECT statements can be sent to the database server in a single request. The problem here is that the tables generated from the queries have automatic names Table and Table1.

How to populate DataTable and dataset using DataReader?

The DataTable and DataSet will be populated with records from the DataReader using Load method of the DataTable. In this article I will explain with an example, how to populate (fill) DataTable and DataSet using DataReader (SqlDataReader) in C# and VB.Net.

How does a DataReader work in VB.NET?

DataReader is a readonly, forward only and connected recordset from the database. In DataReader, database connection is opened until the object is closed unlike DataSet. Using DataReader we can able to access one row at a time so there it is not required storing it in memory.

How is a DataTable added to a dataset?

The following screenshot displays the DataTable with records copied from the DataReader. The records from the Customers table are fetched using SqlDataReader. Then a new DataSet is created and a DataTable is added to the DataSet. Finally the DataReader records are loaded into the DataTable of the DataSet using its Load method.

How to populated a datagridview from a database?

In the below Form, there’s a DataGridView which will be populated from Database using DataReader. You will need to import the following namespaces. Inside the Form Load event, a Select Query is executed over the Customers table of the Northwind database and results are fetched using DataReader (SqlDataReader).