How to check empty and null cells in datagridview using C#

Question

i am trying to check the datagridview cells for empty and null value... but i can not do it right...

for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
    if ((String)dataGridView1.Rows[i].Cells[3].Value == String.Empty)
    {
        MessageBox.Show(" cell is empty");
        return;
    }

    if ((String)dataGridView1.Rows[i].Cells[3].Value == "")
    {
        MessageBox.Show("cell in empty");
        return ;
    }
}

i even tried this codes

if (String.IsNullOrEmpty(dataGridView1.Rows[i].Cells[3].Value))
{
  MessageBox.Show("cell is empty");
  return;
}

can any one help me.. with this...

it is not showing any error message even though.. i leave the cell blank... — Vincent, Nov 24 '11 at 10:14

Davide Piras · Accepted Answer · 2018-07-07T01:14:19.370

25

I would try like this:

foreach (DataGridViewRow rw in this.dataGridView1.Rows)
{
  for (int i = 0; i < rw.Cells.Count; i++)
  {
    if (rw.Cells[i].Value == null || rw.Cells[i].Value == DBNull.Value || String.IsNullOrWhiteSpace(rw.Cells[i].Value.ToString())
    {
      // here is your message box...
    }
  } 
}

edited Jul 07 '18 at 01:14

answered Nov 24 '11 at 10:07

Davide Piras

43,984
10
98
147

IsNullOrWhitespace has error saying 'string' does not contain definition for 'IsNullOrWhitespace' can you tell me why? – Ahmed Faizan Aug 31 '15 at 06:28
2

The "s" in "Whitespace" needs to be capitalized. – Programmer Oct 29 '15 at 16:17

score 6 · Answer 2 · answered Sep 04 '15 at 05:20

6

if (String.IsNullOrEmpty(dataGridView1.Rows[i].Cells[3].Value as String))
{
    MessageBox.Show("cell is empty");
    return;
}

Add as String, it works for me.

answered Sep 04 '15 at 05:20

Mystic Lin

365
4
15

score 4 · Answer 3 · edited Jul 04 '18 at 07:08

4

I think you should use this:

for (int i = 0; i < dataGridView1.RowCount; i++)
{
    for (int j = 0; j < dataGridView1.ColumnCount; j++) 
    {
        if (dataGridView1.Rows[i].Cells[j].Value == DBNull.Value)
        {
            dataGridView1.Rows[i].Cells[j].Value = "null";
        }
    }
}
dataGridView1.Update();

edited Jul 04 '18 at 07:08

Deniz

429
1
4
19

answered Jun 29 '12 at 13:52

Mujtaba

85
2
10

score 4 · Answer 4 · edited Mar 02 '16 at 11:52

4

if (!GridView1.Rows[GridView1.CurrentCell.RowIndex].IsNewRow)
{
     foreach (DataGridViewCell cell in GridView1.Rows[GridView1.CurrentCell.RowIndex].Cells)
    {
        //here you must test for all and then return only if it is false
        if (cell.Value == System.DBNull.Value)
        {
            return false;
        }
    }
}

edited Mar 02 '16 at 11:52

H Aßdøµ

2,925
4
26
37

answered Mar 08 '15 at 09:03

IT Forward

367
2
7
28

V4Vendetta · Answer 5 · 2011-11-24T10:48:05.630

1

I think you should check for null first

Convert.IsDBNull(dataGridView1.Rows[j].Cells[1].FormattedValue)

edited Nov 24 '11 at 10:48

answered Nov 24 '11 at 10:10

V4Vendetta

37,194
9
78
82

are you sure? this is not the usual way to check for nulls and also, why do you check against FormattedValue and not Value only? – Davide Piras Nov 24 '11 at 13:47
@David Suggested `FormattedValue` which would after any specific formats being applied to the cell, post those compare the values – V4Vendetta Nov 25 '11 at 04:34

score 0 · Answer 6 · edited Jul 04 '18 at 08:00

Try this :

foreach (DataGridViewRow row in dataGridView.Rows)
{
    IEnumerable<DataGridViewCell> cellsWithValusInRows = from DataGridViewCell cell in row.Cells
        where string.IsNullOrEmpty((string)cell.Value)
        select cell;

     if (cellsWithValusInRows != null && cellsWithValusInRows.Any())
     {
         //Then cells with null or empty values where found  
     }
}

Then check for the collection if it is null or it has elements.

I hope this was helpful.

score 0 · Answer 7 · edited Mar 13 '17 at 19:02

0

for (int i = 0; i < GV1.Rows.Count; i++)
{
    if ((String)GV1.Rows[i].Cells[4].Value == null)
    {
        MessageBox.Show(" cell is empty");
        return;
    }
}

It's working fine.

edited Mar 13 '17 at 19:02

demongolem

9,474
36
90
105

answered Mar 13 '17 at 17:35

Govind Lumia

1

score 0 · Answer 8 · answered Jul 04 '18 at 10:16

Works perfect for me:

for (int i = dataGridView1.Rows.Count - 1; i >= 0; i--)
{
    DataGridViewRow dataGridViewRow = dataGridView1.Rows[i];

    foreach (DataGridViewCell cell in dataGridViewRow.Cells)
    {
        string val = cell.Value as string;
        if (string.IsNullOrEmpty(val))
        {
            if (string.IsNullOrEmpty(dataGridView1.Rows[i].Cells[3].Value as string)) // If you want to check more then just one cell you could also add "&& (string.IsNullOrEmpty(dataGridView1.Rows[i].Cells[ANY NUMBER].Value as string)
            {
                MessageBox.Show(" cell is empty");
                return;
                /* or to delete replace with:
                dataGridView1.Rows.Remove(dataGridViewRow);
                break;
                */
            }
        }
    }
}

score 0 · Answer 9 · answered Jun 05 '21 at 10:31

0

        // move cell value to Excel
        for (int i = 0; i < grd.Rows.Count; i++)
        {
            for (int t = 0; t < grd.Columns.Count; t++)
            {
                try
                {
                    worksheet.Cells[i + 2, t + 1] = grd.Rows[i].Cells[t].Value.ToString();
                }
                catch (Exception e)
                {
                    Debug.WriteLine(e.HResult + " " + e.Message + " I've always hated null ");
                }
            }
        }

answered Jun 05 '21 at 10:31

StephenSoftware

11
1
3

Please add some explanation to your answer – Michael Rovinsky Jun 05 '21 at 18:16
I have tried all suggestions provided in this post and nobody works well for me... at end I have opted for catch any type of error during setting value... If there is an error I skip the cell otherwise I set the value... I hope my explanation is exaustive. – StephenSoftware Jun 09 '21 at 08:25

How to check empty and null cells in datagridview using C#

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