Unreachable code detected in case statement

Question

I have a code:

    protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
    {
        switch (keyData)
        {
            case Keys.Alt|Ke         


        

Answer 1

In this case, good practice imho would be to end each case with a return, like this:

case Keys.Alt|Keys.D1:
    bool result;
    if (this._condition1) 
        { 
            result = true; 
        } 
        else 
        { 
            result = base.ProcessCmdKey(ref msg, keyData); 
        }
    return result;

Or

case Keys.Alt|Keys.D1:
    bool result = (this._condition1)
        ? true
        : base.ProcessCmdKey(ref msg, keyData); 
    return result;