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Converting a TextBox value to a Decimal

Posted on 2007-11-23
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Last Modified: 2013-11-07
This is driving me nuts! I have had a sniplet of code that has been working for awhile but now it has stopped working and I can not figure out why. All I am trying to do is convert a TextBox value into a decimal so I can store it in my db. pretty simple right? I have the TextBox pre populated with a 0 so that a value can be passed if the user is not going to add any hours for this product. I feel like an idiot right now cuz I nothing I do seems to solve the problem.
decimal manHours;
            string mh = manHoursTextBox.Text;
            manHours = Convert.ToDecimal(mh);
 
 
It started throwing an error if no value was in the textbox, so I tried this:
 
if (string.IsNullOrEmpty(manHoursTextBox.Text) == false)
        {
            Session["mh"] = Decimal.Parse(manHoursTextBox.Text);
        }

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Question by:digital_slavery
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5 Comments
 
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Author Comment

by:digital_slavery
ID: 20341632
Also it does not matter what value I enter into the TextBox it still throws the same error:

Failed to convert parameter value from a String to a Decimal.
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LVL 55

Accepted Solution

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Jaime Olivares earned 250 total points
ID: 20341636
you can use:
decimal.TryParse(mh, out manHours);

the TryParse never generates an exception and returns true if conversion was successful, false if not.
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LVL 55

Expert Comment

by:Jaime Olivares
ID: 20341638
does you textbox has some character different from digits and point sign?
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LVL 29

Expert Comment

by:Göran Andersson
ID: 20342333
The error doesn't occur in the code that you are showing. The error message comes from the database, so somewhere you are putting a string value in a parameter that the database can not convert to a Decimal value.

Show what you are doing with the value up to where you send the query to the database.
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LVL 1

Author Closing Comment

by:digital_slavery
ID: 31410840
Sorry guys, it was a late night and I overlooked the 2 other columns that were set as money which are also decimal values, which is where the problem really was, I was not passing a value from those 2. Note to self: money is also a decimal!
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