What If Someone Types In " "?

Bob T. got sucked into one of those "maybe the new guy can figure it out!" problems, only to open the first page - and then subsequent pages - to see that all of the validation code looked like this...

if(txtloginname.Text=="" 
        || txtloginname.Text==" " 
        || txtloginname.Text=="  ")
{
    lblloginMessage.Visible=true;
    lblloginMessage.Text = "Please Enter the User Id";
    return;
}


if(txtcompanyname.Text=="" 
        || txtcompanyname.Text==" " 
        || txtcompanyname.Text=="  ")
{
    lblloginMessage.Visible=true;
    lblloginMessage.Text = "Please Enter the Company";
    return;
}

if(txtchangereason.Text=="" 
        || txtchangereason.Text==" " 
        || txtchangereason.Text=="  ")
{
    lblloginMessage.Visible=true;
    lblloginMessage.Text = "Please Enter the Change Reason";
    return;
}

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