datagridview CellValidating EVENT problem

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Hello Experts,

I am using CellValidating Event to get the oldvalue of a column of a datagridview.My code is as below;

C#

private void dgvTnasctn_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
       {
           if (!bchk)
           {
               oldValue = Convert.ToInt32(dgvTnasctn[e.ColumnIndex, e.RowIndex].Value);
               if (e.FormattedValue != "")
               {
                   iold = oldValue;
                   inew = Convert.ToInt32(e.FormattedValue);
               }
               else
               {

                   newValue = 0;
               }
           }
       }

in above code Iam facing problem,while clicking anywhere in the gridview it shows the error "Input string was not in correct format" near

C#

"inew = Convert.ToInt32(e.FormattedValue);"

I am stuck here so anybody help me please..

Posted 18-Oct-12 19:41pm

Shivani Dash

Updated 18-Oct-12 19:46pm

D-Kishore

v2

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Aarti Meswania · Answer 1 · 2012-10-18T20:38:00

Solution 1

inew = Convert.ToInt32(e.FormattedValue);

gives error because
you have handle this condition e.FormattedValue but not this,
e.FormattedValue that contains alphabet or special character (except +-.)

which can not be convert in to Int32

so,
check e.FormattedValue before converting in to int32
like this

C#

if (e.FormattedValue.Trim() != "")// check it is empty
              {
                  if IsNumeric(e.FormattedValue.Trim())//check it contains char instead of numbers
                  {
                     iold = oldValue;
                     inew = Convert.ToInt32(e.FormattedValue.Trim());
                  }
              }

C#

public static Boolean IsNumeric(string stringToTest)
{
    int result;
    return int.TryParse(stringToTest, out result);
}

Happy Coding!
:)

Posted 18-Oct-12 20:38pm

Aarti Meswania

Updated 18-Oct-12 21:56pm

v3

Comments

Shivani Dash 19-Oct-12 3:50am

Hii....Thanks 4 help...bt juz tell me 1 thg y ds 2nd 1?

Aarti Meswania 19-Oct-12 3:53am

replace your similar if condition block with
if (e.FormattedValue.Trim() != "")
{
if IsNumeric(e.FormattedValue.Trim())
{
iold = oldValue;
inew = Convert.ToInt32(e.FormattedValue);
}
}

and

copy this New function in your page
public static Boolean IsNumeric(string stringToTest)
{
int result;
return int.TryParse(stringToTest, out result);
}
because it is used in if condition Line no. 3
I have highlight in solution see updated solution please

Shivani Dash 19-Oct-12 4:05am

bt its nt taking Trim() after e.formattedvalue

Aarti Meswania 19-Oct-12 4:17am

yes .trim
will remove white spaces
e.g.
" a " after trim -> "a"