Check Uncheck a checkbox on datagridview

Question

Can someone help me why it doesn t work  I have a checkbox and if I click on it   this should uncheck all the checkbox inside the datagridview which were checked before including the user selected checkbox   Here is the code           private void chkItems CheckedChanged object sender  EventArgs e                        foreach  DataGridViewRow row in datagridview1 Rows                                DataGridViewCheckBoxCell chk    DataGridViewCheckBoxCell row Cells 1                   if  chk Selected    true                                        chk Selected   false                                    else                                       chk Selected   true                                              the checkbox should not be selected  it should be checked   here is the added column              DataGridViewCheckBoxColumn CheckboxColumn   new DataGridViewCheckBoxColumn                CheckBox chk   new CheckBox                CheckboxColumn Width   20              datagridview1 Columns Add CheckboxColumn

User · Answer

The code you are trying here will flip the states (if true then became false vice versa) of the checkboxes irrespective of the user selected checkbox because here the foreach is selecting each checkbox and performing the operations.

To make it clear, store the index of the user selected checkbox before performing the foreach operation and after the foreach operation call the checkbox by mentioning the stored index and check it (In your case, make it True -- I think).

This is just logic and I am damn sure it is correct. I will try to implement some sample code if possible.

Modify your foreach something like this:

    //Store the index of the selected checkbox here as Integer (you can use e.RowIndex or e.ColumnIndex for it).
    private void chkItems_CheckedChanged(object sender, EventArgs e)
    {
        foreach (DataGridViewRow row in datagridview1.Rows)
        {
            DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)row.Cells[1];
            if (chk.Selected == true)
            {
                chk.Selected = false;
            }
            else
            {
                chk.Selected = true;
            }
        }
    }
    //write the function for checking(making true) the user selected checkbox by calling the stored Index

The above function makes all the checkboxes true including the user selected CheckBox. I think this is what you want..

User · Answer

This is how I did it  private void Grid CellClick object sender  DataGridViewCellEventArgs e         if Convert ToBoolean this Grid Rows e RowIndex  Cells  quot Selected quot   Value     false                this Grid Rows e RowIndex  Cells  quot Selected quot   Value   true            else               this productSpecGrid Rows e RowIndex  Cells  quot Selected quot   Value   false

User · Answer

that worked for me after clearing selection  BeginEdit and change the girdview rows and end the Edit Mode   if  dgvDetails RowCount  gt  0                                                dgvDetails ClearSelection                             dgvDetails BeginEdit true                                                   foreach  DataGridViewRow dgvr in dgvDetails Rows                                                        dgvr Cells  quot cellName quot   Value   true                                                    dgvDetails EndEdit

User · Answer

Below Code is working perfect   Select   Deselect a check box column on data grid by using checkbox CONTROL       private void checkBox2 CheckedChanged object sender  EventArgs e                if  checkBox2 Checked    false                        foreach  DataGridViewRow row in dGV1 Rows                                DataGridViewCheckBoxCell chk    DataGridViewCheckBoxCell row Cells 0                        chk Value   chk TrueValue                                else if checkBox2 Checked  true                       foreach  DataGridViewRow row in dGV1 Rows                                DataGridViewCheckBoxCell chk    DataGridViewCheckBoxCell row Cells 0                   chk Value   1                  if  row IsNewRow                                        chk Value   0

User · Answer

here is a simple way to do so    irate through the gridview             foreach  DataGridViewRow row in PifGrid Rows                  store the cell  which is checkbox cell  in an object                 DataGridViewCheckBoxCell oCell   row Cells  Check   as DataGridViewCheckBoxCell     check if the checkbox is checked or not                 bool bChecked    null    oCell  amp  amp  null    oCell Value  amp  amp  true     bool oCell Value      if its checked then uncheck it other wise check it                 if   bChecked                                        row Cells  Check   Value   true                                     else                                       row Cells  Check   Value   false

User · Answer

The code bellow allows the user to un- check the checkboxes in the DataGridView  if the Cells are created in code  private void gvData CellClick object sender  DataGridViewCellEventArgs e        DataGridViewCheckBoxCell chk    DataGridViewCheckBoxCell gvData Rows e RowIndex  Cells 0        if  chk Value    chk TrueValue                gvData Rows e RowIndex  Cells 0  Value   chk FalseValue            else               gvData Rows e RowIndex  Cells 0  Value   chk TrueValue

User · Answer

I was making my own version of a Checkbox to control a DataGridViewCheckBoxColumn when I saw this post wasn t actually answered  To set the checked state of a DataGridViewCheckBoxCell use   foreach  DataGridViewRow row in dataGridView1 Rows        dataGridView1 Rows row Index  SetValues true       For anyone else trying to accomplish the same thing  here is what I came up with    This makes the two controls behave like the checkbox column in Gmail   It keeps functionality for both mouse and keyboard   using System  using System Windows Forms   namespace Check UnCheck All       public partial class Check UnCheck All   Form               public Check UnCheck All                         InitializeComponent                dataGridView1 RowCount   10              dataGridView1 AllowUserToAddRows   false              this dataGridView1 CellContentClick    new System Windows Forms DataGridViewCellEventHandler this dgvApps CellContentClick               this dataGridView1 CellMouseUp    new System Windows Forms DataGridViewCellMouseEventHandler this myDataGrid OnCellMouseUp               this dataGridView1 CellValueChanged    new System Windows Forms DataGridViewCellEventHandler this myDataGrid OnCellValueChanged               this checkBox1 Click    new System EventHandler this checkBox1 Click                      public int chkInt   0          public bool chked   false           public void myDataGrid OnCellValueChanged object sender  DataGridViewCellEventArgs e                        if  e ColumnIndex    dataGridView1 Rows 0  Index  amp  amp  e RowIndex    -1                                DataGridViewCheckBoxCell chk   dataGridView1 Rows e RowIndex  Cells 0  as DataGridViewCheckBoxCell                   if  Convert ToBoolean chk Value     true  chkInt                    if  Convert ToBoolean chk Value     false  chkInt--                  if  chkInt  lt  dataGridView1 Rows Count  amp  amp  chkInt  gt  0                                        checkBox1 CheckState   CheckState Indeterminate                      chked   true                                    else if  chkInt    0                                        checkBox1 CheckState   CheckState Unchecked                      chked   false                                    else if  chkInt    dataGridView1 Rows Count                                        checkBox1 CheckState   CheckState Checked                      chked   true                                                    public void myDataGrid OnCellMouseUp object sender  DataGridViewCellMouseEventArgs e                           End of edition on each click on column of checkbox             if  e ColumnIndex    dataGridView1 Rows 0  Index  amp  amp  e RowIndex    -1                                dataGridView1 EndEdit                              dataGridView1 BeginEdit true                     public void dgvApps CellContentClick object sender  DataGridViewCellEventArgs e                        if  dataGridView1 CurrentCell GetType      typeof DataGridViewCheckBoxCell                                 if  dataGridView1 CurrentCell IsInEditMode                                        if  dataGridView1 IsCurrentCellDirty                                                dataGridView1 EndEdit                                                            dataGridView1 BeginEdit true                                   public void checkBox1 Click object sender  EventArgs e                        if  chked    true                                foreach  DataGridViewRow row in dataGridView1 Rows                                        DataGridViewCheckBoxCell chk    DataGridViewCheckBoxCell row Cells 0                       if  chk Value    chk TrueValue                                                chk Value   chk FalseValue                                            else                                               chk Value   chk TrueValue                                                          chked   false                  chkInt   0                  return                            if  chked    false                                foreach  DataGridViewRow row in dataGridView1 Rows                                        dataGridView1 Rows row Index  SetValues true                                     chked   true                  chkInt   dataGridView1 Rows Count

User · Answer

Looking at this MSDN Forum Posting it suggests comparing the Cell s value with  Cell TrueValue   So going by its example your code should looks something like this  this is completely untested   Edit  it seems that the Default for Cell TrueValue for an Unbound DataGridViewCheckBox is null you will need to set it in the Column definition   private void chkItems CheckedChanged object sender  EventArgs e        foreach  DataGridViewRow row in dataGridView1 Rows                DataGridViewCheckBoxCell chk    DataGridViewCheckBoxCell row Cells 1           if  chk Value     chk TrueValue                        chk Value   chk FalseValue                    else                       chk Value   chk TrueValue                        This code is working note setting the TrueValue and FalseValue in the Constructor plus also checking for null   public partial class Form1   Form       public Form1                 InitializeComponent            DataGridViewCheckBoxColumn CheckboxColumn   new DataGridViewCheckBoxColumn            CheckboxColumn TrueValue   true          CheckboxColumn FalseValue   false          CheckboxColumn Width   100          dataGridView1 Columns Add CheckboxColumn           dataGridView1 Rows Add 4              private void chkItems CheckedChanged object sender  EventArgs e                foreach  DataGridViewRow row in dataGridView1 Rows                        DataGridViewCheckBoxCell chk    DataGridViewCheckBoxCell row Cells 0               if  chk Value    chk FalseValue    chk Value    null                                chk Value   chk TrueValue                            else                               chk Value   chk FalseValue                                   dataGridView1 EndEdit

User · Answer

Here is another example you can try  private void dataGridView CellContentClick object sender  DataGridViewCellEventArgs e                if  e ColumnIndex    dataGridView Columns  Select   Index                        dataGridView EndEdit                 if   bool dataGridView Rows e RowIndex  Cells  Select   Value                                  -- checking current select  needs to uncheck any other cells that are checked                 foreach DataGridViewRow row in dataGridView Rows                                        if  row Index    e RowIndex                                                dataGridView Rows row Index  SetValues true                                             else                                               dataGridView Rows row Index  SetValues false

User · Answer

While all the other answers are correct  I ll add another simple option which worked for me   var r   dataGridView Rows rIndex   var c   r Cells cIndex   var value    bool  c Value   c Value    value    Compressed   var r   dataGridView Rows rIndex   r Cells cIndex  Value      bool  r Cells cIndex  Value    As long as cIndex refers to a cell that is of type DataGridViewCheckBoxCell  this will work fine  Hope this helps somone

User · Answer

I use the CellMouseUp event  I check for the proper column  if  e ColumnIndex    datagridview Columns  columncheckbox   Index    I set the actual cell to a DataGridViewCheckBoxCell  dgvChkBxCell   datagridview Rows e RowIndex  Cells e ColumnIndex  as DataGridViewCheckBoxCell    Then check to see if it s checked using EditingCellFormattedValue  if   bool dgvChkBxCell EditingCellFormattedValue        You will have to check for keyboard entry using the KeyUp event and check the  value property and also check that the CurrentCell s column index matches the checkbox column  The method does not provide e RowIndex or e ColumnIndex

User · Answer

I had the same problem  and even with the solutions provided here it did not work  The checkboxes would simply not change  their Value would remain null  It took me ages to realize my dumbness    Turns out  I called the form1 PopulateDataGridView my data  on the Form derived class Form1 before I called form1 Show    When I changed up the order  that is to call Show   first  and then read the data and fill in the checkboxes  the value did not stay null

User · Answer

you can try this code   DataGridViewCheckBoxCell chk    DataGridViewCheckBoxCell dataGridView1 CurrentRow Cells 0                   dataGridView1 BeginEdit true                   if  chk Value    null     int chk Value    0                                        chk Value   1                                    else                                       chk Value   0                                    dataGridView1 EndEdit

User · Answer

Simple code for you it will work  private void dgv CellClick object sender  DataGridViewCellEventArgs e        if  dgv CurrentRow Cells  ColumnNumber   Value    null  amp  amp   bool dgv CurrentRow Cells  ColumnNumber   Value                dgv CurrentRow Cells  ColumnNumber   Value   false          dgv CurrentRow Cells  ColumnNumber   Value   null            else if  dgv CurrentRow Cells  ColumnNumber   Value    null                 dgv CurrentRow Cells  ColumnNumber   Value   true

User · Answer

All of the casting causes errors  nothing  here I tried worked  so I fiddled around and got this to work     foreach  DataGridViewRow row in dataGridView1 Rows                        if  row Cells 0  Value    null  amp  amp   bool row Cells 0  Value                                Console WriteLine row Cells 0  Value

User · Answer

Try the below code it should work   private void checkBox2 CheckedChanged object sender  EventArgs e         if  checkBox2 Checked    false                foreach  DataGridViewRow row in dGV1 Rows                        DataGridViewCheckBoxCell chk    DataGridViewCheckBoxCell row Cells 0               chk Value   chk TrueValue                     else if  checkBox2 Checked    true                foreach  DataGridViewRow row in dGV1 Rows                        DataGridViewCheckBoxCell chk    DataGridViewCheckBoxCell row Cells 0               chk Value   1              if  row IsNewRow                                chk Value   0

User · Answer

You can use this code on your grid CellClick event for check or unchecked cell checkbox    private void Grid CellClick object sender  DataGridViewCellEventArgs e                if  e ColumnIndex    0                        Grid Rows e RowIndex  Cells e ColumnIndex  Value    Grid Rows e RowIndex  Cells e ColumnIndex  Value    null   true      bool Grid Rows e RowIndex  Cells e ColumnIndex  Value

[c#] Check/Uncheck a checkbox on datagridview

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