How to sum double number and show in messagebox

Question

0.00/5 (No votes)

See more:

, +

Hello friend,i am facing an issue that I want to show double values and I want to show that values in text box or message box I have sum values but I don't know how to show in message box when I use this query message box.show(sum1.tostring());so it returns null values please guide me how can i show this sum values in message box.Thanks

What I have tried:

Double sum1 = 0;
           //int rowIdx1 = dataGridView2.Rows.Count;
           for (int i = 0; i < dataGridView2.Rows.Count; ++i)
           {
               sum1 = Double.Parse(dataGridView2.Rows[i].Cells[1].Value.ToString());
           }
         message box.show(sum1.tostring());

Posted 5-Mar-17 1:40am

Member 9983063

Updated 5-Mar-17 6:42am

Add a Solution

Comments

[no name] 5-Mar-17 7:45am

Actually, it does not return anything as your code would not compile. Then once you get the compilation errors fixed so your code will run, learn how to use the debugger to find and fix your logic errors.

Member 9983063 5-Mar-17 7:50am

there is no error

[no name] 5-Mar-17 7:55am

Yes there is. I can see it plain as day. Your code will not compile on anyone's computer so it will not run at all.

[no name] 5-Mar-17 7:55am

Sum? At the Moment it Looks like the last value.
How is about sum1+= ...
Or maybe I don't get the Point.

6 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Karthik_Mahalingam · Answer 1 · 2017-03-05T02:01:00

This will take care of empty/null values in the cells

Double sum = 0;          
            for (int i = 0; i < dataGridView2.Rows.Count; ++i)
            {
                double value;
                Double.TryParse(dataGridView2.Rows[i].Cells[1].Value.ToString(),out value);
                sum += value;
            }
            MessageBox.Show(sum.ToString());

Peter Leow · Answer 2 · 2017-03-05T02:04:00

Solution 3

Shouldn't it be

sum1 += Double.Parse(dataGridView2.Rows[i].Cells[1].Value);

In fact, you should use Double.TryParse Method (String, Double) (System)[^]

Posted 5-Mar-17 2:04am

Peter Leow

Updated 5-Mar-17 2:06am

v2

Kornfeld Eliyahu Peter · Answer 3 · 2017-03-05T02:04:00

It seems you are using SQL... so use SQL's power and sum the value at the SQL level...
SUM (Transact-SQL)[^]

SQL

SELECT SUM(double_colum) FROM table1

But if you insist to do it in code, do it right...

C#

Double sum1 = 0;
for (int i = 0; i < dataGridView2.Rows.Count; ++i)
{
  // this line is all wrong:
  // 1. Why to convert back and forth your data - it is a number in SQL it will be a number here too!!!
  // 2. In every iteration you put the last value in sum1 instead of adding it... use += instead of = !!!
  sum1 = Double.Parse(dataGridView2.Rows[i].Cells[1].Value.ToString());
}
message box.show(sum1.tostring());

A suggestion to do it better...

C#

double sum = 0
foreach (DataRow oDataRow in dataGridView2.Rows)
{
  sum += oDataRow.Cells[1].Value;
}

Graeme_Grant · Answer 4 · 2017-03-05T02:08:00

Solution 5

IF you want the simple format as an alternative to the above answers:

C#

sum1 = sum1 + Double.Parse(dataGridView2.Rows[i].Cells[1].Value);

which is exactly the same as

C#

sum1 += Double.Parse(dataGridView2.Rows[i].Cells[1].Value);

Posted 5-Mar-17 2:08am

Graeme_Grant

Patrice T · Answer 5 · 2017-03-05T06:42:00

When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute, it is an incredible learning tool.

Debugger - Wikipedia, the free encyclopedia[^]
Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]

The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.

sajidur rahman · Answer 6 · 2017-03-05T02:01:00

C#

Double sum1 = 0;
            //int rowIdx1 = dataGridView2.Rows.Count;
            for (int i = 0; i < dataGridView2.Rows.Count; ++i)
            {
                sum1 += Double.Parse(dataGridView2.Rows[i].Cells[1].Value.ToString());
            }
          message box.show(sum1.tostring());

[edit]: added in code block.

How to sum double number and show in messagebox

6 solutions

Solution 2

Solution 3

Solution 4

Solution 5

Solution 6

Solution 1

Add your solution here

Preview 0