update row

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C#2.0

C#

I am begginers in c sharp . I want to make a simple project in c # with sql database. I creat a table name "updatetbl in database name test1 and fill the record as bellow

accountno sequence
1001 25
1001 5
1001 7
1001 9
1001 10
1001 15

accountno,sequence is int

Now I want to update programatically in single click button to update the value has been changed as bellow example.

accountno sequence
1001 1
1001 2
1001 3
1001 4
1001 5
1001 6