How you will set the datarelation between two columns?
Answers were Sorted based on User's Feedback
Answer / swapna
ADO.NET provides DataRelation object to set relation
between two columns.It helps to enforce the following
constraints,a unique constraint, which guarantees that a
column in the table contains no duplicates and a foreign-
key constraint,which can be used to maintain referential
integrity.
A unique constraint is implemented either by simply setting
the Unique property of a data column to true, or by adding
an instance of the UniqueConstraint class to the
DataRelation object's ParentKeyConstraint.
As part of the foreign-key constraint, you can specify
referential integrity rules that are applied at three
points,when a parent record is updated,when a parent record
is deleted and when a change is accepted or rejected.
Is This Answer Correct ? | 3 Yes | 0 No |
Answer / muthu kumar
DataSet d = new DataSet();
DataColumn parentDC = new
DataColumn(d.Tables["parentTable"].Columns["id"]);
DataColumn childDC = new
DataColumn(d.Tables["ChildTable"].Columns["id"]);
DataRelation ds = new DataRelation("relation name",
parentDC, childDC);
d.Relations.Add(ds);
Is This Answer Correct ? | 4 Yes | 2 No |
How do you connect to sql server database without using sqlclient?
How to work with disconnected data - the dataset and sqldataadapter?
How to connect and retrieve data from database using dataset
What is the use of sqldatareader class?
What is maximum pool size in ado.net connection string?
What are two important objects of ADO.Net?
How to identify the updated rows in a dataset?
What are the functions of oledbdataadapter?
What is microsoft ado?
What are the steps in connecting to database?
can u tell me the how to get the print for the form
What is the difference between ADO and ADO.Net?