Stored Procedure using parameters from listbox - multiple select

Hi have 2 listboxs with selectmode set to 'multiple', the options in the listboxs are:

All
1
2
3

All
a
b
c

The comma separated list I'm creating to pass to my sql looks like this:

           
String strSegment = String.Empty;
            foreach (ListItem li in lstNum.Items)
            {
                if (liSegment.Selected)
                {
                    strSegment += "'" + liSegment.Value + "',";
                }
            }
            strSegment = strSegment.Substring(0, strSegment.Length - 1);

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My Stored Procedure looks like this:

      
select * from 
	VIEW_TOTAL
	where
	Numbern in (@NumList)
	and 
	Letters in (@LetterList)

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I'm lost about what to do when a user select 'All' or 'All','1','2','3' or doesn't select anything.
I know these are a lot of questions, I'm hoping to get some guidance or an example of how to handle passing multi select values to sql to return a dataset.  Thank you in advance for any assistance.
Scarlett72Asked:
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guru_samiCommented:
You can set the value for All to 1,2,3 and pass it to the storedproc.
And when nothing is selected you pass null.
Check on that null in the storedproc and take appropriate action.
0
lmredCommented:
You can do something like this to get you started:

@String NVARCHAR(40)
@String2 NVARCHAR(40)

DECLARE @NextString NVARCHAR(40)
DECLARE @Pos INT
DECLARE @NextPos INT
DECLARE @Delimiter NVARCHAR(40)

IF (@string IS NULL)
Begin
SET @Delimiter = ','
--SET @String = @String + @Delimiter
SET @Pos = charindex(@Delimiter,@String)

WHILE (@pos <> 0)
BEGIN
SET @NextString = substring(@String,1,@Pos - 1)
SELECT @NextString -- Show Results
SET @String = substring(@String,@pos+1,len(@String))
SET @pos = charindex(@Delimiter,@String)
END
End

IF (@string2 IS NOT NULL)
Begin
--SET @String2 = @String2 + @Delimiter
SET @Pos = charindex(@Delimiter,@String2)

WHILE (@pos <> 0)
BEGIN
SET @NextString = substring(@String2,1,@Pos - 1)
SELECT @NextString -- Show Results
SET @String = substring(@String2,@pos+1,len(@String2))
SET @pos = charindex(@Delimiter,@String2)
END
End
0

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