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Finding Rows in ADO.NET

Posted By: Syed Shakeer Hussain     Posted Date: June 26, 2010    Points: 2   Category :ADO.Net
 
ADO.NET implements three basic forms to locate Rows - The Find method as applied to the Rows collection, the Find method as applied to the DataView object and the Contains method as applied to the Rows collection.

DataRowCollection Find and Contains Method

The DataRowCollection is a major component of the DataTable. While the DataColumnCollection defines the schema of the table, the DataRowCollection contains the actual data for the table, where each DataRow in the DataRowCollection represents a single row.

You can call the Add and Remove methods to insert and delete DataRow objects from the DataRowCollection. You can also call the Find method to search for DataRow objects that contain specific values in primary key columns, and the Contains method to search character-based data for single words or phrases.

DataView Find and FindRows Method

Using the Find and FindRows methods of the DataView, you can search for rows according to their sort key values. The case-sensitivity of search values in the Find and FindRows methods is determined by the CaseSensitive property of the underlying DataTable. Search values must match existing sort key values in their entirety in order to return a result.


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I work with SQL Server 2008. Now I need in help for solving such task: Return the number of distinct locations that are either employee or customer locations in each country. I have table Employees (empid, country,region,city) and table Customers(custid, country,region,city).

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output:
country         numlocations
--------------- ------------


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