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Update Integer Field When Null Value Is Being Passed as Parameter

Posted on 2010-11-26
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Last Modified: 2012-05-10
I have a drop down list in which the user can select blank(null), 1, 2, or 3.
I need to get the selected value of the drop down list and pass it as a parameter to update the database file.  The field that is being updated with this value is an integer.
Here is the code that I'm using:
 e.Command.Parameters("@Action_Priority").Value = ddlPriority.SelectedValue
How can I get this to work when the value is null????
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Question by:mmtcunningham1
3 Comments
 
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Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 1000 total points
ID: 34217533
this should do;
if  ddlPriority.SelectedValue = "" then
 e.Command.Parameters("@Action_Priority").Value = DBNull.Value
else
 e.Command.Parameters("@Action_Priority").Value = ddlPriority.SelectedValue
end if

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Expert Comment

by:Alpesh Patel
ID: 34217605
yes "angelIII:" is 100% right.
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LVL 32

Assisted Solution

by:Erick37
Erick37 earned 1000 total points
ID: 34217658
If the parameter of the stored procedure has a default value of NULL, then you do not even have to pass in the null value.

SQL Procedure:
Action_Priority INT = NULL  --Null is default

.NET:
if  ddlPriority.SelectedValue <> "" then
    e.Command.Parameters("@Action_Priority").Value = ddlPriority.SelectedValue
end if
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