cannot update value in the system

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Hi all,
here is my code.

With DGVMargin
            For i As Integer = 0 To .Rows.Count - 1
                If txttype.Text = "NORMAL" Then
                    If txtDiscount.Text = .Rows(i).Cells("DiscountNormal").Value Then
                        decodeDiscount()
                        Updatefunction()
                        Exit For
                    Else
                        decodeDiscount()
                        Insert()
                        Exit For
                    End If
  Next
        End With

Now i want to update the txtDiscount value if it is already exist,else it will go to insert a new data.
Now the problem is it will not going to update the value even already have the same txtDiscount value. The system will always go to the Insert() function. It will not go Updatefunction to update the value.
Is there any problem or mistake in my code?
Your help is appreciated. Thanks.

Posted 18-Jan-13 15:34pm

Des DC

Updated 18-Jan-13 15:45pm

v3

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Tharaka MTR · Answer 1 · 2013-01-18T16:27:00

Solution 1

If it is always go to the Insert() function that's mean

VB

If txtDiscount.Text = .Rows(i).Cells("DiscountNormal").Value Then

above conditions is false for all time. My suggestion is add the breakpoints to that line and verify the value of txtDiscount.Text and Rows(i).Cells("DiscountNormal").Value separately. then you can get the idea whats wrong here.

It seems this is Casting issue.
Convert

Rows(i).Cells("DiscountNormal").Value.ToString()

and check.
or
CAST both txtDiscount.Text and

Rows(i).Cells("DiscountNormal").Value

to discount type (integer/decimal) and check

Posted 18-Jan-13 16:27pm

Tharaka MTR

Updated 18-Jan-13 17:17pm

v4

Comments

Des DC 18-Jan-13 22:44pm

Hi,Tharaka MTR.
Yes.I add breakpoints there and checked the value.
the value is correct,but don't know why it will not compare with the current data to check the value.

Tharaka MTR 18-Jan-13 23:13pm

Could you please convert the Row value to string CAST both txtDiscount.Text and Rows(i).Cells("DiscountNormal").Value to discount type (integer/decimal) and check

Des DC 18-Jan-13 23:48pm

Tharaka MTR,i tried your way.
Rows(i).Cells("DiscountNormal").Value.ToString() is not work.
Sorry i have to ask a question about second way,is the second cast like this?
CDec(txtDiscount.Text)=CDec(Rows(i).Cells("DiscountNormal").Value)?

Tharaka MTR 19-Jan-13 0:25am

when you using Rows(i).Cells("DiscountNormal").Value.ToString(), what is the error you got?

you can using Convert.ToDecimal()
http://msdn.microsoft.com/en-us/library/hf9z3s65(v=vs.90).aspx?cs-save-lang=1&cs-lang=vb#code-snippet-2

Des DC 19-Jan-13 1:06am

When I'm using Rows(i).Cells("DiscountNormal").Value.ToString() there is no error. Just the output is not as expected.
But I tried it again and again with my code just now. It sometimes can update the value but sometimes cant. I'm trying to find out the what's the problem. Anyway thanks for your reply. :)

Tharaka MTR 19-Jan-13 1:26am

well. add break point to insert() function in the Else part. when the it breaks, recheck the discount text box value and cell value.

Des DC 21-Jan-13 19:36pm

i solved the question by separate the two function into two different button. Thanks anyway. :-)