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ASP.Net Assign null value to decimal datatype

Posted on 2007-08-03
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Last Modified: 2013-11-26
i am trying to call a stored procedure from My C# code. It has three parameters but the third one(elementChange) is null sometimes and has a value at other times. The data type for the elementChange field is decimal. In cases where there are no value to pass i set the variable elementChange= null
but gives me the error message ..cannot convert null to decimal  how do i handle this ?
Any suggestions is welcome..
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Question by:saswati_m
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Author Comment

by:saswati_m
ID: 19628412
cmd.AddInParameter("@seriesChange", DbType.Decimal, System.Convert.DBNull)  this passes a null value for this parameter and it works.
But I am not sure why this does not work
cmd.AddInParameter("@seriesChange", DbType.Decimal, System.DBNull)
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Expert Comment

by:Gary Davis
ID: 19629345
In the SP, define a default for the parameter in case it is not supplied. In the code, if null, don't bother passing the parameter (skip the cmd.AddInParameter). That's one way to do it.
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Author Comment

by:saswati_m
ID: 19629846
I have done it that way, ie by specifying a default value for the parameter. But my question is why am I not being able to pass a null value for the decimal data type. Is it becaus e decimal is a value type and null a referece type . May be the convert does the boxing and that is why it works.
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Accepted Solution

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Gary Davis earned 200 total points
ID: 19631466
A decimal column in SQL can have a null but a decimal variable in C# can not unless you use the new (2.0) "nullable types". Use the question mark to declare a variable that may contain a null.

decimal? amount = 1.50;
amount = null;
if (amount.HasValue) ... /* Test if amount is null or not */

For more info, see http://www.codeguru.com/csharp/.net/net_data/datagrid/article.php/c10393/

Gary Davis
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