Error :Input string was not in a correct format.

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I am trying to convert a string to an int like this and to increment it:
count = Convert.ToInt32(Hidden_id.Value) + 1;
but results this error: Input string was not in a correct format.

Posted 30-Nov-12 2:24am

lovitaxxxx

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OriginalGriff · Answer 1 · 2012-11-30T02:29:00

Solution 1

The string in Hidden_id.Value is not an integer - it contains characters which are not numeric.

Either use int.TryParse instead, or check what you are loading into the field, as it is not a valid number!

Posted 30-Nov-12 2:29am

OriginalGriff

Comments

lovitaxxxx 30-Nov-12 8:41am

it gives me error even doing this:
int count = int.Parse(Hidden_id.Value);
even this one:
int count = Convert.ToInt32(Hidden_id.Value);

OriginalGriff 30-Nov-12 8:59am

That is why I said use TryParse, not Parse - it reports a problem via the bool return value if the conversion fails, rather than throwing an exception.
But you need to look at what is in the value, and how it got there since the user can't enter a value to a Hidden field.

lovitaxxxx 30-Nov-12 8:41am

how to convert a hidden field value to int?

codeninja-C# 30-Nov-12 9:04am

Annaa,
can you provide your Hidden_id.Value?
--SJ

lovitaxxxx 30-Nov-12 9:02am

I want the hidden value to keep nje row index of the datatable.. so to store it during the navigation through records

OriginalGriff 30-Nov-12 9:05am

So what do you put in it? How do you do it?

lovitaxxxx 30-Nov-12 9:09am

for example to navigate to the next record through a button:
protected void Button2_Click(object sender, EventArgs e)
{

if (Hidden_id.Value.Trim() != null)
count = int.Parse(Hidden_id.Value);

count += 1;

if (count < ds.Tables["Person"].Rows.Count - 1)
{

navigate();
Hidden_id.Value = count.ToString();

}

OriginalGriff 30-Nov-12 9:24am

Why put it on the client at all? Why not keep it on the server via the Session variable? It's probably a lot less hassle (and it's certainly a little less traffic between the server and client)

lovitaxxxx 30-Nov-12 9:31am

i tried this and doesnt give any error
protected void Button2_Click(object sender, EventArgs e)
{

if (Hidden_id.Value.Trim() != null)
{
bool res = int.TryParse(Hidden_id.Value, out count);

if (res == true)
{
count = int.Parse(Hidden_id.Value);

count += 1;

if (count < MaxRows - 1)
{

navigo();
Hidden_id.Value = count.ToString();

}
}

}

But still the next button doesnt work correctly.. when i click it it doesnt give any result :/
what to do now?

OriginalGriff 30-Nov-12 10:25am

As I said: you need to look at what the value is (because it isn't an integer) - but I would put the value in the Session rather than a hidden field.