How To Cast Empty String

I want to replace a column value with a null if the string is empty. I would have thought this simple expression would do it:

RTRIM([FromContractSymbol]) == "" ?  NULL(DT_STR, 0, 1252)  : (DT_STR, 6, 1252)FromContractSymbol

Yet, I get the following error:

For operands of the conditional operator, the data type DT_STR is supported only for input columns and cast operators. The expression "...see above..." has a DT_STR operand that is not an input column or the result of a cast, and cannot be used with the conditional operation.

The expression works if I replace the NULL(DT_STR, 0, 1252) with say "A" and the expression works on other non-string columns. (As in "NULL(DT_I1) : (DT_I1)100")

 

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Cast String To Int

Hi ,

I have a problem with casting a string number to int.
for exmaple i have the number '0110' (string) and i would like it to be 110. or '0001' to be 1.
i tried to do:
cast(MyNUM as int) .
but i get "Syntax error converting the nvarchar value 'O322' to a column of data type int."

is anyone have any idea how to solve it ?

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example
create view v_GuestOrder
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Id_Guest OrderName
-------- -----
1 spoon
2 phone
3
4 tv

I need something similar to

Select
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Hi folks,

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Hi,
 
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Here is the relevant code-behind:
 

TextBox tb = (TextBox)formView.FindControl("SpouseName");

tb.Text = e.Item.Cells[4].Text;

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if (e.Item.Cells[5].Text.Length > 0)

{

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dp.DateValue = DateTime.Parse(e.Item.Cells[5].Text);

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SalesData.dbo.tbl_CYProcessedSales ps
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----------------------------
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2 Blue
3 Red
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------------------------------
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