Input string was not in a correct format

Question

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I created a result page in which my result is show on repeater and if result paging number is show on other repeater.
for example:
A
B
C
D
1 2 3 4 5
Here ABCD are the result on one page and 12345 are paging, if i click on 2 then it show me next result like EFGH. Till then it is working fine, but the problem is...
when i have only one result A so that in paging repeater 1 is show
A
1
and when i click on this 1 then it is giving error 'Input string was not in a correct format'

C#

ArrayList pages = new ArrayList();
            for (int i = iStartIndex; i <= iEndIndex; i++)
                if (i == PageNumber)
                {
                    pages.Add("<strong>" + (i + 1).ToString() + "</strong>");
                }
                else
                {
                    pages.Add((i + 1).ToString());
                }

            rptPaging.DataSource = pages;
            rptPaging.DataBind();

protected void rptPaging_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        PageNumber = Convert.ToInt32(e.CommandArgument) - 1; //in this line error is coming.
        BindRepeaterData();
    }

Posted 4-Jul-14 3:51am

Raj Negi

Updated 5-Jul-14 4:31am

v2

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Comments

PIEBALDconsult 4-Jul-14 10:03am

Use the debugger. Examine the value of e.CommandArgument .

Raj Negi 5-Jul-14 10:36am

while debugging i found e.CommandArgument contains value 1 but inside the strong tag.
Due to this strong tag error occur.
i found where problem occur, actually i am using strong tag to bold the page number. If i remove strong then no error occur but i want to bold the number. any solution?

DamithSL 4-Jul-14 23:19pm

update the question with your aspx page repeater code

Raj Negi 5-Jul-14 10:36am

while debugging i found e.CommandArgument contains value 1 but inside the strong tag.
Due to this strong tag error occur.
i found where problem occur, actually i am using strong tag to bold the page number. If i remove strong then no error occur but i want to bold the number. any solution?

3 solutions

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CHill60 · Answer 1 · 2014-07-04T06:19:00

As suggested by PIEBALDconsult in their comment...

Put a breakpoint on the line

PageNumber = Convert.ToInt32(e.CommandArgument) - 1;

Examine the contents of e.CommandArgument

It might be null, it might be text such as "Empty". Whatever it is it will not be the string form of any integer so the Convert.ToInt32 will fail.

Place a check before the code e.g.

C#

if(e.CommandArgument != null) // replace with whatever the offending value is
{
     PageNumber = Convert.ToInt32(e.CommandArgument) - 1;
     BindRepeaterData();
}

[EDIT - update in light of new information]

Match match = Regex.Match(e.CommandArgument, @"\d+", RegexOptions.IgnorePatternWhitespace);
if(match.Success) 
{
     PageNumber = Convert.ToInt32(match.ToString) - 1;
     BindRepeaterData();
}

You will also need the following

using System.Text.RegularExpressions;

DamithSL · Answer 2 · 2014-07-05T04:46:00

Solution 3

try below

C#

if(e.CommandArgument != null)
{
    PageNumber =0;
    if(int.TryParse(e.CommandArgument, out PageNumber))
    {
      PageNumber --; 
    }
    BindRepeaterData();
}

Posted 5-Jul-14 4:46am

DamithSL

Comments

Raj Negi 5-Jul-14 14:02pm

error: argument type 'object' is not assignable to parameter type 'string'

Ashok G Patel · Answer 3 · 2014-07-04T03:58:00

Solution 1

your pagenumber variable should be in

Int

typpe
other wise you need to write this

C#

PageNumber = (Convert.ToInt32(e.CommandArgument) - 1).toString();

Posted 4-Jul-14 3:58am

Ashok G Patel

Updated 4-Jul-14 9:53am

v2

Comments

Raj Negi 4-Jul-14 10:17am

yes it is in INT

Input string was not in a correct format

3 solutions

Solution 2

Solution 3

Solution 1

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