Input string was not in a correct format.

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hi

 public void ssaa(GridView grv1,GridView grv2)
    {
     
        if (RdoYes.Checked == true)
        {
            ArrayList da1 = new ArrayList();
            ArrayList da2 = new ArrayList();
            int a1 = 0, a2 = 0;

            foreach (GridViewRow row1 in grv1.Rows)
            {
                

                a1 = System.Convert.ToInt32(row1.Cells[2].Text);
                a2 = System.Convert.ToInt32(row1.Cells[3].Text);
                da1.Add(a1);
                da2.Add(a2);
                   foreach ( int ir in da1 )
                {
                        
                        foreach (GridViewRow row2 in grv2.Rows)
                        {
                        for (int id = 0; id < ir; id++)
                        {
                           response.write(row1.cells[0].text);
                          
                        }
                    }
                }

            }
        }
      
}

i am calling this function in button click event i am getting the error Input string was not in a correct format.

Posted 17-Feb-11 18:35pm

gowdhami

Updated 17-Feb-11 21:35pm

v5

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Olivier Levrey · Answer 1 · 2011-02-17T21:58:00

Solution 2

If your string is not null and you are getting this error, then it means your string contains not only numbers. For example converting "10 days" will throw an exception. You should only keep the numbers before converting the string.

Posted 17-Feb-11 21:58pm

Olivier Levrey

Comments

Dima Popov 18-Feb-11 4:03am

You're right.

gowdhami 18-Feb-11 4:20am

i give only 4 but the output is not getting for me..could u explain more

Dima Popov 18-Feb-11 4:40am

You can prepare the string for parsing by checking each char in it with Char.IsDigit. And do not forget negative numbers' preceding minus and floating point (it's value is stored as string in System.Globalization.CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator, but in fact it's only '.' or ',').

Olivier Levrey 18-Feb-11 4:24am

If you want to convert a string to an int, then all characters inside the string should be numbers (except first one: it can be '-'). So before converting the string, do something like: txt = txt.Split(new char[]{' '})[0];
This line of code will keep only the first part of your string: the part before the space.

Abhinav S · Answer 2 · 2011-02-17T18:37:00

Solution 1

a1 = System.Convert.ToInt32(row1.Cells[2].Text);                <br />
a2 = System.Convert.ToInt32(row1.Cells[3].Text);

You are trying to convert text to integers.
Make sure these values are not null.

Posted 17-Feb-11 18:37pm

Abhinav S

Updated 17-Feb-11 18:47pm

v3

Comments

[no name] 18-Feb-11 0:47am

Good Call.

Abhinav S 18-Feb-11 0:48am

Thanks.

arindamrudra 18-Feb-11 0:54am

Great answer. null checking is required and if you have doubt that all the value may not be integer type, then please use int Num;
bool isNum = int.TryParse(row1.Cells[3].Text.Trim(), out Num);
if (isNum)
{}

gowdhami 18-Feb-11 2:18am

i tried in button click event also but it was showing the same error.and also i checked that values are not null

Pravin Patil, Mumbai 18-Feb-11 3:53am

and more than that if you want to store null value into the int, make the variable int?.

Olivier Levrey 18-Feb-11 4:00am

MSDN states that providing a null parameter will make the method return 0. So it can't be that.

Dima Popov 18-Feb-11 4:00am

System.Convert.ToInt32 itself checks if value is null and returns 0. Then it calls int.Parse() which throws the exception.

SunilChavan1 · Answer 3 · 2011-02-17T23:16:00

public void ssaa(GridView grv1,GridView grv2)
    {
     
        if (RdoYes.Checked == true)
        {
            ArrayList da1 = new ArrayList();
            ArrayList da2 = new ArrayList();
            int a1 = 0, a2 = 0;

            foreach (GridViewRow row1 in grv1.Rows)
            {
                
if(!String.IsNullOrEmpty(System.Convert.ToInt32(row1.Cells[2].Text))
{
                a1 = System.Convert.ToInt32(row1.Cells[2].Text);
}
 
 if(!String.IsNullOrEmpty(System.Convert.ToInt32(row1.Cells[3].Text))
{

                a2 = System.Convert.ToInt32(row1.Cells[3].Text);
}
                da1.Add(a1);
                da2.Add(a2);
                   foreach ( int ir in da1 )
                {
                        
                        foreach (GridViewRow row2 in grv2.Rows)
                        {
                        for (int id = 0; id < ir; id++)
                        {
                           response.write(row1.cells[0].text);
                          
                        }
                    }
                }

            }
        }
      
}