How prevent duplicate values in database table through c# code

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C#

C#4.0

how to we prevent duplicate value on database table through c# code when inserting details

Posted 10-Dec-13 2:57am

sathishvenkat

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OriginalGriff · Answer 1 · 2013-12-10T02:59:00

Solution 1

Simple: check first to see if they are already in the database, and if they are, don't insert them...

Without your data and table definitions, we can say no more.

Posted 10-Dec-13 2:59am

OriginalGriff

Comments

CPallini 10-Dec-13 9:28am

5.

thatraja · Answer 2 · 2013-12-10T03:02:00

Solution 2

0)Use Constraints[^](PrimaryKey, Unique)

1)Before insert the record, check existence of the value in that table, sample query like below, if count is above 0 then value exists & you should notify the user about duplicate value(OR generate different ID....it's based on your requirement)

SQL

SELECT COUNT(*) FROM Table_Name WHERE Column_Name='SomeValue'

Posted 10-Dec-13 3:02am

thatraja

Comments

Ashish_Agrawal 10-Dec-13 9:23am

OP asked through C# code. :)

thatraja 10-Dec-13 9:29am

Don't underestimate our OP, he knows how to write code based on suggestions.

:)