How to select all checkboxes in datagridview

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hi i have written belw code to select all checkboxes but i am unable to do so.please help

What I have tried:

CheckBox HeaderCheckBox=null;
    bool IsHeaderCheckBoxClicked=false;
    private void AddHeaderCheckBox()
    {
        HeaderCheckBox= new CheckBox();
        HeaderCheckBox.Size=new Size(15,15);
        //add check ti DGV
        this.dataGridView1.Controls.Add(HeaderCheckBox);
    }
    private void HeaderCheckBoxClick(CheckBox HCheckBox)
    {
        IsHeaderCheckBoxClicked =true;
        foreach(DataGridView Row in dataGridView1.Rows)
            (DataGridViewCheckBoxCell)Row.CellStateChanged["chk"].value=HCheckBox.Checked;
    }

public void MainFormLoad(object sender, EventArgs e)
		{

AddHeaderCheckBox();
		}

Posted 25-May-18 1:23am

Member 13844327

Updated 25-May-18 4:42am

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[no name] 25-May-18 8:49am

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Shivnandan singh · Answer 1 · 2018-05-25T04:43:00

Solution 1

foreach (DataGridViewRow row in dataGridView1.Rows)
{
       DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell) row.Cells[0];
       chk.Value = !(chk.Value == null ? false : (bool) chk.Value); //because chk.Value is initialy null
}

Posted 25-May-18 4:43am

Shivnandan singh

Comments

Member 12505620 5-Jun-23 7:16am

Is it possible to clear the checked values when I unchecked the header checkbox?