this.dataGridView1.Columns["AddToCartButton"].Frozen = true;

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 private void dataGridView1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Delete)
            {
                 //Keys. тавиад ямар товчлуур дарахаар яах уу гэдгээ тодорхойлох л үлдлээ.
            }
        }

private void dataGridView1_KeyUp(object sender, KeyEventArgs e)
{
          if (e.KeyCode == Keys.Delete)
            {                 //Keys. тавиад ямар товчлуур дарахаар яах уу гэдгээ тодорхойлох л үлдлээ.
            }
}

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Format Description	Code Snippet	Output
Short date pattern (d)	DateTime.Now.ToString("d")	11/8/2010
Long date pattern (D)	DateTime.Now.ToString("D")	Monday, November 08, 2010
Full date/time pattern - short time (f)	DateTime.Now.ToString("f")	Monday, November 08, 2010 3:39 PM
Full date/time pattern - long time (F)	DateTime.Now.ToString("F")	Monday, November 08, 2010 3:39:46 PM
General date/time pattern - short time (g)	DateTime.Now.ToString("g")	11/8/2010 3:39 PM
General date/time pattern - long time (G)	DateTime.Now.ToString("G")	11/8/2010 3:39:46 PM
Month/day pattern (M)	DateTime.Now.ToString("M")	November 08
Round-trip date/time pattern (O)	DateTime.Now.ToString("O")	2010-11-08T15:39:46.4804000-08:00
RFC 1123 pattern (R)	DateTime.Now.ToString("R")	Mon, 08 Nov 2010 15:39:46 GMT
Sortable date/time pattern (s)	DateTime.Now.ToString("s")	2010-11-08T15:39:46
Short time pattern (t)	DateTime.Now.ToString("t")	3:39 PM
Long time pattern (T)	DateTime.Now.ToString("T")	3:39:46 PM
Universal sortable date/time pattern (u)	DateTime.Now.ToString("u")	2010-11-08 15:39:46Z
Universal full date/time pattern (U)	DateTime.Now.ToString("U")	Monday, November 08, 2010 11:39:46 PM
Year/month pattern (Y)	DateTime.Now.ToString("Y")	November, 2010

Format Description	Code Snippet	Output
Abbreviated month name, day and year	DateTime.Now.ToString("MMM d, yyyy")	Nov 8, 2010
Day of the week name plus month name and day of month	DateTime.Now.ToString("dddd, MMMM d")	Monday, November 8
Month/Day/Year, using exactly two digits for each	DateTime.Now.ToString("MM/dd/yy")	11/08/10

Format Description	Code Snippet	Output
Relative time for date more than a year ago	var birthDate = new DateTime(2008, 9, 1 9, 45, 0); birthDate.ToRelativeDateString()	on September 1, 2008
Relative time for date several months ago	DateTime.Now.AddMonths(-6).ToRelativeDateString()	on May 8
Relative time for date five days ago	DateTime.Now.AddDays(-5).ToRelativeDateString()	five days ago
Relative time for yesterday	DateTime.Now.AddDays(-1).ToRelativeDateString()	yesterday
Relative time for several hours ago	DateTime.Now.AddHours(-3.14159).ToRelativeDateString()	three hours ago
Relative time for more than five minutes ago	DateTime.Now.AddMinutes(-6.25).ToRelativeDateString()	six minutes ago
Relative time for less than five minutes ago	DateTime.Now.AddMinutes(-2.5).ToRelativeDateString()	a few minutes ago
Relative time for within past minute	DateTime.Now.AddSeconds(-15).ToRelativeDateString()	less than a minute ago
Universal format for date in current year	DateTime.Now.ToUniversalFormat()	Monday, Nov 8 at 3:39 PM
Universal format for date in other year	var birthDate = new DateTime(2008, 9, 1 9, 45, 0); birthDate.ToUniversalFormat()	Monday, Sep 1, 2008 at 9:45 AM

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Datagridview дээр checkbox ашиглахаар түүний чагтлагдсан эсэхийг мэдэхийн тулд доорхи кодыг ашиглана.

 DataGridViewCheckBoxCell CbxCell = (DataGridViewCheckBoxCell)Datagridview1.Rows[rowIndex].Cells["Status"];

                if ((bool)CbxCell.Value == true)
                {
                    //Do stuff
                }
                else
                {
                    //Do Stuff
                }

Мөн DBNULL байж болох учраас шалгахдаа дараах байдлаар бас шалгаж болно:

if (!DBNull.Value.Equals(CbxCell.Value) && (bool)CbxCell.Value == true)
{
    //Do stuff
}
else
{
    //Do Stuff
}

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