conversion from string to int

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dd.Id = Convert.ToInt32(txtid.Text);

if i execute the form in internet explorer,it is executing. but if enter the values for field given above it shows the error as below

Input string was not in a correct format.

Posted 3-Dec-13 20:00pm

Member 10443519

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thatraja 4-Dec-13 2:13am

What values you're entering?

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Accepted Answer · 2013-12-03T20:13:00

Solution 1

That means the String you are entering is not a valid integer.

You should go with int.TryParse[^].

This will not throw you exception. Rather it will try to parse the String, else it will not do anything.

So, do like...

C#

int num = 0;

bool res = int.TryParse(txtid.Text, out num);

if (!res)
{
    // String is not a number.
}

Posted 3-Dec-13 20:13pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Updated 3-Dec-13 20:14pm

v2

Comments

Thanks7872 4-Dec-13 2:15am

Clear enough. +5

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 4-Dec-13 2:24am

Thanks a lot Rohan Leuva... :)

Member 10443519 7-Sep-16 7:12am

Thank You Rohan

Sampath Lokuge · Accepted Answer · 2013-12-03T20:20:00

Solution 2

It looks like your 'txtid.Text' is a nullable value (or empty).You cannot convert a null value to an Int32. You need to ensure that each value is not null (or not empty).

Check below checking before the conversion.

C#

if (!string.IsNullOrEmpty(txtid.Text))
{
dd.Id = Convert.ToInt32(txtid.Text);
}

Posted 3-Dec-13 20:20pm

Sampath Lokuge

Comments

Member 10443519 7-Sep-16 7:13am

Thank you Sampath

Karthik_Mahalingam · Accepted Answer · 2013-12-03T21:22:00

Might be you have added space at the end of the text,
Its always better to trim the value of TextBox

Instead of Convert.ToInt32 you can use TryParse

C#

int value = 0;
bool isInteger =   int.TryParse(btnshow.Text.Trim(), out value);
if (isInteger)
{
    // converted successfully
    // value contains the data which u entered in text box.
}
else
{
    // invalid entry, but it will not throw error.
    // here the value will be 0
}

conversion from string to int

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