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Convert string to decimal and do computations on it

Posted on 2007-11-24
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Last Modified: 2013-12-25
I have a vb 2005 application. Right now I am using Access as the backend database. Instead of using Currency and percentage data types in the database, I have them as text or string data types.
I am able to convert the string to decimal and format for percentage and currency so that the textboxes show the correct values like the example below:
---------------------------------------------------------------------
 Private Sub txtRetailDisc_Validated(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtRetailDisc.Validated
        Dim PercentageRate As Decimal = CDec(txtRetailDisc.Text)
        txtRetailDisc.Text = FormatPercent(PercentageRate)
       End Sub
---------------------------------------------------------------------------

Here is my problem and question.
I need to take the value of txtRetailPrice and multiply it by the txtRetailDisc textbox to show the value in the txtDiscountPrice.text ( textbox)
I either can't get a result or get a mismatch when I try to do this.
Is there a way to convert a string and then do computations on it or should I change the data types in the database. I have tried that, but I cannot get Currency or percentages to format in the vb 2005 program.
I am not using any bound data controls either, this is all being done through code.
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Question by:mindserve
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5 Comments
 
LVL 19

Expert Comment

by:LordOfPorts
ID: 20344429
Decimal.Parse(txtDiscountPrice.text) should convert the String to a Decimal and allow further calculations
http://msdn2.microsoft.com/en-us/library/system.decimal.parse.aspx

To round a decimal variable
Decimal.Round(VariableName, 2)
http://msdn2.microsoft.com/en-us/library/system.decimal.round.aspx

To integrate the decimal variable in a string
String.Format("The formatted decimal {0}.", VariableName)

I hope this information is helpful.

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LVL 1

Author Comment

by:mindserve
ID: 20344471
Well, Microsoft has alot of info but I need an example of how to do this. Do you know of any?
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Accepted Solution

by:
LordOfPorts earned 125 total points
ID: 20344584
Sorry about that, I should have been more specific! Here is an example:
Dim RetailPrice As Decimal = Decimal.Parse(txtRetailPrice.Text)
        Dim RetailDisc As Decimal = Decimal.Parse(txtRetailDisc.Text) / 100
        Dim DiscountResult As Decimal
        Dim DiscountValue As Decimal
 
        DiscountValue = RetailPrice * RetailDisc
        DiscountResult = RetailPrice - DiscountValue
        txtDiscountPrice.Text = Decimal.Round(DiscountResult, 2).ToString()

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Author Comment

by:mindserve
ID: 20345411
I keep getting errors for some reason. Says Input string is not in the correct format...
0
 
LVL 1

Author Comment

by:mindserve
ID: 20345451
Ok, I had to remove the previous formatting I had entered. Now it works.
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