Increment Integer Column Value by Variable

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I'm using the following code to increment an integer column value by a variable.But the code seems not updating the value.What i'm i doing wrong?

SqlCommand command = new SqlCommand("UPDATE maintable SET counter=counter+@cvalue WHERE uname=@username", c);
command.Parameters.AddWithValue("@username", "me");
command.Parameters.AddWithValue("@cvalue", value);
command.ExecuteNonQuery();

Update:

Try

UPDATE maintable SET counter=ISNULL(counter,0)+@cvalue WHERE uname=@username

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is counter and cvalue both having datatype as int or decimal ? else increment won't be done for string

SqlCommand command = new SqlCommand("UPDATE maintable SET counter=ISNULL(counter,0)+ISNULL(@cvalue,0) WHERE uname=@username", c);
command.Parameters.AddWithValue("@username", "me");
command.Parameters.AddWithValue("@cvalue", value);
command.ExecuteNonQuery();

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Why don't you directly pass the data rather then passing like parameter.

  SqlCommand command = new SqlCommand("UPDATE maintable SET counter=(ISNULL(counter,0) + " + value + ") WHERE uname='me'", c);
  command.ExecuteNonQuery();

Please check once your value of variable "value" .

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Comments
  • are you getting any error?
  • @PSK No exception is thrown..
  • what is datatype of your variable value?
  • @DarkRob Please see the update.I'm using the SQL Management studio to check the results.
  • Please check the value of your variable once.
  • Yeah,the datatype is int.
  • to troubleshoot just try with UPDATE maintable SET counter=ISNULL(counter,0)+1 WHERE uname='staticusername' in your query and check if it works from code and in SQL server management studio
  • and also try with uname='"+@username+"'
  • because your uname is varchar data type