cancel check from checkBox

I have some checkBox in my page,

I want that the user checked maximum data but no more,

how can I cancel the select option.

here is my code:

PHP Code:

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protected void CheckBox2_CheckedChanged(object sender, EventArgs e)
    {
        int select = 0;
        int max =3;
        if (max > 0)
        {
            for (int i = 0; i < checkBoxGrid.Items.Count; i++)
            {
                CheckBox cb = (CheckBox)checkBoxGrid.Items[i].FindControl("CheckBox1");
                if (cb.Checked)
                {
                    select++;
                    if (max == select)
                    {
                      //HERE I WANT TO CANCEL
              
                    }
                }
            }
        }
      
    } 


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thanks!

Try this. I am not sure.

Code:

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cb.checked=false

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Not very elegant but you could use this:

Code:

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                    select++;
                    if (max == select)
                    {
                      //HERE I WANT TO CANCEL
                      ((CheckBox)sender).Checked = false;
             
                    }

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senthilkumartd: Your method won't cancel the checkbox that was last checked but the checkbox that was last evaluated that made the count equal max.