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datagridview

anil john

I am getting an error:object reference not set to an instance of an object
ma code:
for (int i = 0; i < dgPreveleges.RowCount - 1; i++)
            {
                if((string)dgPreveleges.Rows[i].Cells["dgColSelectAll"].Value.ToString () == "false")
                {
                    MessageBox.Show("hi");
                }
            }
plz help me to rectify this error

2 Replies

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Sukesh Marla14y ago
I thing is no cell with dgColSelectAll

If your problem still persisit share your code.
Vulpes14y ago
Assuming you're sure that "dgColSelectAll" is a valid column name, then the only other thing that can be null here is the cell's Value property if the cell is empty.

To adjust for that, try:

for (int i = 0; i < dgPreveleges.RowCount - 1; i++)
{
object val = dgPreveleges.Rows[i].Cells["dgColSelectAll"].Value;

if (val != null && val.ToString() == "false")
{
MessageBox.Show("hi");
}
else
{
MessageBox.Show("empty cell or value not false");
}
}