Seleccionar tabla .Net

[jaullo]

Creo que deberias usar javascript, algo asi:

Código Javascript:

<script type="text/javascript" language="javascript">
    function ChangeCheckBoxState(id, checkState) {
        var cb = document.getElementById(id);
        if (cb != null)
            cb.checked = checkState;
    }
 
    function ChangeAllCheckBoxStates(checkState) {
        // Toggles through all of the checkboxes defined in the CheckBoxIDs array
        // and updates their value to the checkState input parameter
        if (CheckBoxIDs != null) {
            for (var i = 0; i < CheckBoxIDs.length; i++)
                ChangeCheckBoxState(CheckBoxIDs[i], checkState);
        }
    }
 
    function ChangeHeaderAsNeeded() {
        // Whenever a checkbox in the GridView is toggled, we need to
        // check the Header checkbox if ALL of the GridView checkboxes are
        // checked, and uncheck it otherwise
        if (CheckBoxIDs != null) {
            // check to see if all other checkboxes are checked
            for (var i = 1; i < CheckBoxIDs.length; i++) {
                var cb = document.getElementById(CheckBoxIDs[i]);
                if (!cb.checked) {
                    // Whoops, there is an unchecked checkbox, make sure
                    // that the header checkbox is unchecked
                    ChangeCheckBoxState(CheckBoxIDs[0], false);
                    return;
                }
            }
 
            // If we reach here, ALL GridView checkboxes are checked
            ChangeCheckBoxState(CheckBoxIDs[0], true);
        }
    }
</script>