check an error in code (replace method code )

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Hi developers,
I am vishal sharma.
I load a csv file into a dataset, view it in datagridview. I am working on a replace method.

My problem is that my code for replaceing wildcards from datagridview is working properly but after executing the code an error message is show on screen by a message box

I think I'm not writing the code properly, so please write them properly.
My code is:

public void Button1_Click(object sender, EventArgs e)
{
  try
  {
    for(int i= 0;i<DGV.Rows.Count;i++)
    {
      foreach(DataGridViewCell cell in DGV.Rows[i].Cells)
      {
        cell.Value = cell.Value.ToString().Replace(comma.ToString(), slash.ToString());
        cell.Value = cell.Value.ToString().Replace(colon.ToString(), Blank.ToString());
      }
    }
  }
  catch(System.Exception ex)
  {
    MessageBox.Show(ex.Message);
  }
}

The error that shows up after executing this code:

" object refrence not set to an instance of an object "

Please developers, solve this problem Immediately
I will be thankfull to you.

Posted 11-Nov-10 18:18pm

vishu1999a

Updated 11-Nov-10 18:23pm

JF2015

v2

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**JF2015** · Answer 1 · 2010-11-11T18:25:00

Does this work?
maybe cell.Value is null and this throws your exception.

C#

public void Button1_Click(object sender, EventArgs e)
{
  try
  {
    for(int i= 0;i<DGV.Rows.Count;i++)
    {
      foreach(DataGridViewCell cell in DGV.Rows[i].Cells)
      {
        if(cell.Value == null)
          continue;

        cell.Value = cell.Value.ToString().Replace(comma.ToString(), slash.ToString());
        cell.Value = cell.Value.ToString().Replace(colon.ToString(), Blank.ToString());
      }
    }
  }
  catch(System.Exception ex)
  {
    MessageBox.Show(ex.Message);
  }
}

Suthish Nair · Answer 2 · 2010-11-11T18:43:00

Solution 2

better put a breakpoint and check each line for null.

Posted 11-Nov-10 18:43pm

Suthish Nair