Placing Checkbox In Gridview In C#

i need to add checkbox column to my gridview in c#.

i have my code:

foreach (GridViewRow objRow in GrdDynamicControls.Rows)
{
if (dttableDetails.Columns.Contains(strColumnName))
{
position = dttableDetails.Columns[strColumnName].Ordinal;
if (strtype.Contains("CheckBox"))
{
try
{
GrdDynamicControls.Rows[i].Cells.RemoveAt(position);
chkCheckBox.ID = strControlName;
chkCheckBox.AutoPostBack = true;
tcCheckCell.Controls.Add(chkCheckBox);
objRow.Cells.Add(tcCheckCell);
// GrdDynamicControls.Rows[i].Cells.AddAt(position, tcCheckCell);
}
catch { }
chkCheckBox.CheckedChanged += new EventHandler(chkCheckBox_CheckedChanged);
}
}
}

but this is overwritting the checkbox for each objrow in gridview. im not able to get the checkbox for that particular column for all the rows in gridview.