Question

Is it possible to validate an already bounded gridview?

A | B | C | D
2 | 3 | a | 5

For example, I wanted to check if the data inside the columns are non-letters.
In this case, I wanted to highlight or something to tell that there’s a letter in Column 2 Row 2.

Answer 1

Something like this would do the trick.

Regex numeric = new Regex(@"^\d+$");

void GridView_RowDataBound(Object sender, GridViewRowEventArgs e) {
    // check out all cells in the current row
    foreach(var cell in e.Row.Cells) {
        // do some validation thingy
        if(!numeric.Match(cell.Text).Success) {
             cell.CssClass = "error"; // put error class on the cell
        }
    }
}