Data convertion problem in C#

Question

1.00/5 (2 votes)

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I have one text box in c# windows form.
I am taking input.
next I want to convert that to double. Here is problem is coming.

double.TryParse(txtdisc.Text, out b);

i debugged and saw what is there actutally coming. In that text box value is there but in that "b" no value is coming.I declared "b" as double b=0.00.
so in "b" only 0 is coming. What to do.

What I have tried:

I tried in other ways also like convert.ToDouble and double.Parse but no use. I am getting this here only. other form same one worked with other values. Why like this.
what to do now.

Posted 13-Apr-17 2:03am

vijay_bale

Updated 13-Apr-17 2:18am

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Comments

[no name] 13-Apr-17 8:09am

"In that text box value", you saw WHAT value is there? Is it a string that is really a double? Are you checking the return value of TryParse?

vijay_bale 13-Apr-17 8:13am

I checked. Here TryParse return value is 0.But in textbox value is there 156.

[no name] 13-Apr-17 8:44am

Then there is something you aren't telling us. TryParse does NOT return 0.

vijay_bale 13-Apr-17 8:47am

@NotPloitically,
double.TryParse(txtdisc.Text, out b);
thats it. Nothing to hide form you people, who are trying to help me.

[no name] 13-Apr-17 8:59am

"Here TryParse return value is 0", TryParse does NOT return 0. So there MUST be something you are not telling us.

Dave Kreskowiak 13-Apr-17 9:11am

TryParse RETURNS a true/false value, not a number. You're not checking for that return value. If it's false, there is a problem with the string you passed in that makes the parse operation fail for the value type you're looking for.

vijay_bale 13-Apr-17 9:22am

I saw that value. False is Coming.

Dave Kreskowiak 13-Apr-17 9:27am

That means there's a problem with the input string. Since we can't see that and you haven't told us exactly what that string is, we can't tell you what's wrong with it.

vijay_bale 13-Apr-17 9:39am

@ Dave
just i am calculating some datagrid cells valu and storing in a variable double type.
that value i am converting into string and displaying in that textbox.That textbox only I am converting in to double and want to do some calculation with it and dsiplay output.

Dave Kreskowiak 13-Apr-17 9:41am

And that tells us absolutely NOTHING about the string you're trying to convert to a double.

vijay_bale 13-Apr-17 9:44am

@ dave, I am converting a double value to string and displaying in textbox. that textbox value only I am trying to convert into double.
this tells you NOTHING then what you want to know just tell me.

Dave Kreskowiak 13-Apr-17 9:50am

Oh, I don't know. How about the ACTUAL VALUE OF txtdisc.Text!

When the debugger stops and shows you the line where the exception is thrown, you hover the mouse of the .Text part and it'll show you the value.

Do you really not know how to use the debugger?

vijay_bale 13-Apr-17 10:00am

txtdisc value is 156.

Dave Kreskowiak 13-Apr-17 10:25am

Well, that's not it because "156" parses just fine as a double. There's something else in there you're not telling us.

Dave Kreskowiak 13-Apr-17 11:02am

Put a breakpoint on the TryParse line and run the code. When the debugger stops, hover the mouse of the .Text portion of the line and examine the value. It's not "156". It's different from what you think it is.

The debugger is there to debug YOU, not the code. It's there to improve your understanding of the code.

vijay_bale 13-Apr-17 11:48am

http://tinypic.com/r/2rdu3ow/9
http://tinypic.com/r/2r3ci2p/9

here I put the images of debugging also. just take a look

Dave Kreskowiak 13-Apr-17 12:06pm

Damn, you're making this far more difficult than it needs to be.

There are goofy characters before the 604.72 that you're trying to convert. Those characters are why you cannot get the 604.72 converted to a double.

vijay_bale 14-Apr-17 1:08am

I removed that currency symbol. Now it is converted.thankyou so much for your help and telling me the problem.

vijay_bale 13-Apr-17 9:48am

This is the code I am calculating datagridview cells sum value and finally I am converting and storing that into a textbox.
public void totalsum()
{
int i = 0;
double j = 0.00;

for (i = 0; i < dataGridView1.Rows.Count; ++i)
{

j += Convert.ToDouble(dataGridView1.Rows[i].Cells[5].Value);
Math.Round(j, 2, MidpointRounding.ToEven);
//return (int)Math.Floor(j + .49);
//MessageBox.Show(j.ToString());
}
txtitmtotal.Text = j.ToString("c");

[no name] 13-Apr-17 9:55am

this piece of code does not have the code you shared in problem description. Where that code comes in picture. Use Improve question option to add your proper code causing issue

vijay_bale 13-Apr-17 10:02am

convertion will be single line one na.
double.TryParse(txtitemtotal.Text, out b);
I cahnged that txtdisc.text with txtitemtotal.text
thinking that maybe prob with that textbox. so I changed.

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User 4180254 · Answer 1 · 2017-04-13T02:18:00

Solution 1

Can you try with below piece of code -

double b;
bool IsDoubleValue = double.TryParse(textBox1.Text, out b);

//do whatever you want with this value
var doubleTypeValue = IsDoubleValue ? Convert.ToDouble(textBox1.Text) : 0;

Posted 13-Apr-17 2:18am

User 4180254

Comments

vijay_bale 13-Apr-17 8:31am

@ vinod, I tried What you gave here.but value 0 is coming to b.that textbox value is 156.

[no name] 13-Apr-17 9:08am

Return type for TryParse id Boolean only, there might be something wrong if you get 0. Share the code

vijay_bale 13-Apr-17 9:16am

IsDoubleValue False Is coming.
bool IsDoubleValue = double.TryParse(txtitmtotal.Text, out b);
double d=b* 10;
var doubleTypeValue = IsDoubleValue ? Convert.ToDouble(txtitmtotal.Text) : 0;

MessageBox.Show(d.ToString());

[no name] 13-Apr-17 9:51am

Well in problem description you mention "txtdisc.Text" and in this code you are referencing "txtitmtotal.Text". So the question is which textbox really you want to use here and causing issue?

vijay_bale 13-Apr-17 9:54am

I changed the text box thinking that maybe problem with that text box. so other one is showing here.