Allow only positive integer values in a certain Column of DataGridView?

Something like this?

private void dataGridView1_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{
    int value = 0;
    int.TryParse(e.FormattedValue.ToString(), out value);
    if (value > 0)
        e.Cancel = false;
    else
        e.Cancel = true;
}

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If you mean strictly positive, the code above works. If you mean to include zero, the code ">" needs to be replaced with ">=".

You can use a shortcut for the if/else. I wrote it out to show what is going on, but if you are familiar with booleans and if you like short code, you can do this as well:

private void dataGridView1_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{
    int value = 0;
    int.TryParse(e.FormattedValue.ToString(), out value);
    e.Cancel = value <= 0;
}

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Try http://www.componentfactory.com/ FREE toolkit.  It has a tool for this.

Glad you found a solution, but why then did you ask "how I can limit the user input in the DataGridView_CellValidating event..."? If you want to diverge from your original q. please inform the involved experts in the thread.