Need help with checking/unchecking datagridviewcheckboxcolumn in C#

Question

Hi, I'm really having difficulty with this. Can someone pls help me why this does not work?

private void dataGridViewempl_CellClick(object sender, DataGridViewCellEventArgs e)
    {

      
      if (dataGridViewempl.CurrentCell.ColumnIndex == 6)
      {
        if (dataGridViewempl.CurrentCell.Value != null)
        {
          bool checkstate = (bool)dataGridViewempl.CurrentCell.Value;

          if (checkstate == false)
            dataGridViewempl.CurrentCell.Value = true;
          else
            dataGridViewempl.CurrentCell.Value = false;

        }
        else
          dataGridViewempl.CurrentCell.Value = true;

      }

OR this?

private void dataGridViewempl_CellClick(object sender, DataGridViewCellEventArgs e)
    {

      CheckBox deletebox = new CheckBox();
      deletebox = (CheckBox)dataGridViewempl.CurrentCell.Value;
      
      if (dataGridViewempl.CurrentCell.ColumnIndex == 6)
      {
        if (deletebox != null)
        {
          
          if (deletebox.Checked == false)
            deletebox.Checked = true;
          else
            deletebox.Checked = false;

        }
        

      }

Appreciate any help!

 

Answer 1

Hi,

Use this,

 if (dataGridViewempl.CurrentCell.ColumnIndex == 6)

              {

                if (dataGridViewempl.CurrentCell.Value != null)

                {

                  bool checkstate = (bool)dataGridViewempl.CurrentCell.GetEditedFormattedValue(e.RowIndex,DataGridViewDataErrorContexts.Commit);

                  if (checkstate == false)

                    dataGridViewempl.CurrentCell.Value = true;

                  else

                    dataGridViewempl.CurrentCell.Value = false;

 

                }

                else

                  dataGridViewempl.CurrentCell.Value = true;

 

Hope this helps you..

 

 

 

---

Regards, Kris.

Answer 2

Hi Kris444,

Thanks! But it still doesn't work. I'm really confused. Does it have something to do with some properties of my datagrid? I set the EditMode to EditOnEnter, and either of my code above works. But if it's EditProgrammatically, none of it (and yours) work at all.

Answer 3

Hi Chair88,

Based on your code, I am not fully understand what readlly do you want to achieve.

But for EditMode, the EditOnEnter mode means that editing begins when the cell receives focus, this mode is useful when pressing the TAB key to enter values across a row, or when pressing the ENTER key to enter values down a column.

And the EditProgrammatically means Editing begins only when the BeginEdit method is called.

As you don't fire the BeginEdit method, so it will not work for you.

You can also refer to this official document to fully understand the DataGridViewEditMode Enumeration:
http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridvieweditmode.aspx

---

Vin Jin [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Answer 4

Hi,

Thanks all for your time. Actually I have solved this with help from the other forum I have visited.

@Vin Jin, I was trying to make the checkbox inside my datagridview check/uncheck by clicking the cell. I previously thought it had something to do with the EditMode property. Just found out that the code I'm using  (where I cast the checkbox cell into a boolean type and get its value "true" (checked) or "false" unchecked)) does not work because it lacks this line of code:

dataGridViewempl.CellClick += new System.Windows.Forms.DataGridViewCellEventHandler(dataGridViewempl_CellClick);

Thanks much!

 

Answer 5

Hi Chair88,

Congratulation! I am glad that you have solved your problem. Thanks for sharing your solution, and please mark it as answer. Thanks.

---

Vin Jin [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.