How to get DataGridView Checkbox Checked or not ! [modified]

[Sr Frank]

I have CheckBox in my datagridview1 and I am trying to get CheckBox is check or not. for(int i; i< datagridview1.rows.count; i++) { bool IsChecked = ((CheckBox)datagridview1.rows[i].Cell["ID"].Value).Checked; } Above code is not working,please let me know where I am wrong. I am using C#, VisualStudio2008. Thanks

modified on Tuesday, April 6, 2010 7:50 AM

[Lost User]

Hi, I'm using something like this;

bool IsChecked = (bool)row.Cells[0].Value;

I are Troll :suss:

[Sr Frank]

Not Working! Error: Object reference not set to an instance of an object.

[Lost User]

Sr...Frank wrote:

Not Working! Error: Object reference not set to an instance of an object.

I'm guessing that "row" is NULL. Try this;

for(int i; i < datagridview1.rows.count; i++)
{
bool IsChecked = (bool)datagridview1.rows[i].Cells[0].Value;
}

You can try the code below to compare against, should display the basic idea;

public partial class MainForm : Form
{
DataGridView grid = new DataGridView();
Button testButton = new Button();

public MainForm()
{
	InitializeComponent();
	
	testButton.Dock = DockStyle.Bottom;
	testButton.Click += delegate 
	{  
		bool result = (bool)grid.Rows\[0\].Cells\[0\].Value;
		MessageBox.Show("Checked: " + result);
	};
	
	grid.Dock = DockStyle.Fill;
	grid.Columns.Add(new DataGridViewCheckBoxColumn());
	grid.Rows.Add(true);
	grid.Rows.Add(false);
	
	Controls.Add(grid);
	Controls.Add(testButton);			
}

}

Enjoy :)

I are Troll :suss:

[carlecomm]

Please change "bool IsChecked = ((CheckBox)datagridview1.rows[i].Cell["ID"].Value).Checked;" to "bool IsChecked = ((CheckBox)datagridview1.rows[i].Cell["ID"].FindControl["CheckBox1"]).Checked;" and have another try.

[Ashrafuddin]

Not Working: Error:Object reference not set to an instance of an object. I am not able to use FindControl[] in windows applications using c# .net. So please does any one will provide my the suitable code.