Add two text box

Question

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Hi there, I am getting problem two add two tex tbox and put the result in the third text box. Here is my code. It concatenate and put it the third textbox rather than to add it.

Double news;
news = Double.Parse(txtAmt.Text) + Double.Parse(txtOldSalary.Text);
txtNewSalary.Text = news.ToString();

Posted 12-Oct-10 1:24am

Mikiyas Abebe

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7 solutions

Solution 1

Double news;
news=Convert.ToDouble(txtAmt.Text) + Convert.ToDouble(txtOldSalary.Text);
txtNewSalary.Text = news.ToString();

Posted 12-Oct-10 1:38am

beena b patel

Comments

Mikiyas Abebe 12-Oct-10 8:23am

It tried it but it has the same problem

Solution 2

simple you can use convert.todouble

Posted 12-Oct-10 1:39am

chandrashekhar racharla

Solution 5

first you convert these two values in double and then add it.

double a=Double.parse(txtAmt.Text);
double b=Double.parse(txtOldSalary.Text);
news=a+b;
txtNews.text=news+"";

Posted 12-Oct-10 2:09am

gans 2

Comments

Mikiyas Abebe 12-Oct-10 8:23am

It tried it but it has the same problem

Solution 6

All of the above answers are close, but unless you're handling the TextChanged event to ensure that only numeric values are entered as the user types, you could run into problems.

I would do this:

C#

double x1;
double x2;
if (double.TryParse(textBox1.Text, out x1) && double.TryParse(textBox2.Text, out x2)
{
    textBox3.Text = string.Format("{0}", x1 + x2);
}

Posted 12-Oct-10 2:14am

#realJSOP

Updated 12-Oct-10 2:17am

v2

Comments

Mikiyas Abebe 12-Oct-10 8:29am

it the same it doesn't work for me

Eeriepilot 12-Oct-10 14:29pm

This is the best method!!!

Solution 7

Double abc = Convert.ToDouble(TextBox1.Text.Trim()) + Convert.ToDouble(TextBox2.Text.Trim());

Posted 12-Oct-10 2:28am

stambekar

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Dave Paras · Accepted Answer · 2010-10-12T01:49:00

Solution 4

You can try this..

MIDL

Double news;
news = Convert.ToDouble(txtAmt.Text) + Convert.ToDouble(txtOldSalary.Text);
txtNewSalary.Text = news.ToString();

Posted 12-Oct-10 1:49am

Dave Paras

Comments

Mikiyas Abebe 12-Oct-10 8:22am

It tried it but it has the same problem

Dave Paras 12-Oct-10 9:08am

Can you provide sample data you are using in txtAmt and txtOldSalary textbox

Mikiyas Abebe 13-Oct-10 0:20am

for example 10 + 23 it put the answer like this 1023

Dave Paras 13-Oct-10 0:37am

steps
----
1. Add three textboxes and button in your form.
2. on button click event paste following code.
---
Double news;
news = Convert.ToDouble(txtAmt.Text) + Convert.ToDouble(txtOldSalary.Text);
txtNewSalary.Text = news.ToString();
---
3. Run program. (F5)
4. Enter 10 in txtAmt textbox
5. Enter 23 in txtOldSalary textbox
6. Click button
7. You'll get result in txtNewSalary textbox, sum of 10 and 23 (33).

Mikiyas Abebe 13-Oct-10 15:39pm

Actually I put the code in the textchange event of the txtamt. Why it doesn't work for it.

Dave Paras 14-Oct-10 0:31am

Here is TextChange event
------------------------

private void txtAmt_TextChanged(object sender, EventArgs e)
{
Double news;
/*(txtAmt.Text.Trim() != "" ? Convert.ToDouble(txtAmt.Text) : 0)
check if OldSalary and txtAmt is not blank, if is it so convert to double else return 0
initially Convert.ToDouble raise error when txtOldsalary does not contain anything, to avoid this use ternary operator.*/
news = (txtAmt.Text.Trim() != "" ? Convert.ToDouble(txtAmt.Text) : 0) + (txtOldSalary.Text.Trim() != "" ? Convert.ToDouble(txtOldSalary.Text) : 0);
txtNewSalary.Text = news.ToString();
}

Dave Paras 14-Oct-10 0:36am

Alternate to above solution without using variable.

private void txtAmt_TextChanged(object sender, EventArgs e)
{
txtNewSalary.Text = Convert.ToString((txtAmt.Text.Trim() != "" ? Convert.ToDouble(txtAmt.Text) : 0) + (txtOldSalary.Text.Trim() != "" ? Convert.ToDouble(txtOldSalary.Text) : 0));
}

Mikiyas Abebe 17-Oct-10 5:09am

I thank u from the bottom of my heart now it works.

Dave Paras 18-Oct-10 2:14am

Please ACCEPT this as ANSWER, as it works.
Thanks.

**Dalek Dave** · Accepted Answer · 2010-10-12T01:40:00

Solution 3

Double abc = Convert.ToDouble(TextBox1.Text.Trim()) + Convert.ToDouble(TextBox2.Text.Trim());

Does that help?

Posted 12-Oct-10 1:40am

Dalek Dave

Comments

CPallini 12-Oct-10 7:48am

There must be Mr.Univoter, around...

Mikiyas Abebe 12-Oct-10 8:22am

It tried it but it has the same problem