How make it decimal and how to stop the error message

Mfwamba Tshimanga

Hi!

I do write this code. But I would like to see the number I enter in the textbox be decimal. How can I do it please.

Other point strange, when I am trying to delete my textbox that should make operation. When the last number is deleted I receive a error message:

Input string was not in a correct format.

private void quantidadeFactu_KeyUp(object sender, KeyEventArgs e)

{

float quantidadeFact;

float precoFact;

float totFact;

quantidadeFact = Convert.ToInt32(quantidadeFactu.Text);//for example in this quantitity textbox when I delete until the latest number. The error message appear.

precoFact = Convert.ToInt32(precosaidaFactu.Text);

totFact = quantidadeFact * precoFact;

totalFactu.Text = totFact.ToString();

}

6 Replies

Know the answer? Post it — somebody with the same question will find it here.

Anupam Singh12y ago
Try this :

private void quantidadeFactu_KeyUp(object sender, KeyEventArgs e)
{
float quantidadeFact;
float precoFact;
float totFact;
quantidadeFact = float.Parse("12");//for example in this quantitity textbox when I delete until the latest number. The error message appear.
precoFact = float.Parse("120");
totFact = quantidadeFact * precoFact;
totalFactu.Text = totFact.ToString();
}

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Mfwamba Tshimanga12y ago
Sorry Sirs, all these codes doesnt work. I do exactly as you wrote. Did you try it before? Thanx
0
Anupam Singh12y ago
Hi ,

Actually you have declared quantidadeFact and precoFact as float
and you are assighning

integer to it using :
quantidadeFact = Convert.ToInt32(quantidadeFactu.Text).

For this you can use Convert.ToDouble or float.Parse method.

Hope it helps
0
Ranjit Powar12y ago
hey, if you are using float variables then convert textbox value to float as

quantidadeFact =float.Parse(quantidadeFactu.Text);
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Mfwamba Tshimanga12y ago
Thanx for the answer. its working very well when deletinging number without giving that error message. But the number inside of the textbox doesnt be converted to decimal. Why?
0
Ranjit Powar12y ago
hi try this

private void quantidadeFactu_KeyUp(object sender, KeyEventArgs e)
{
if(string.IsNullOrEmpty(quantidadeFactu.Text))
{
return;
}
double quantidadeFact;
double precoFact;
double totFact;
quantidadeFact = Convert.ToDouble(quantidadeFactu.Text);
precoFact = Convert.ToDouble(precosaidaFactu.Text);
totFact = quantidadeFact * precoFact;
totalFactu.Text = totFact.ToString();
}

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