C#

Mohammad Dayyan wrote:

I receive this error :
Property or indexer 'string.this[int]' cannot be assigned to -- it is read only

What's wrong ?

A String object is called immutable (read-only) because its value cannot be modified 
once it has been created. Methods that appear to modify a String object actually return a 
new String object that contains the modification. If it is necessary to modify the actual
contents of a string-like object, use the System.Text.StringBuilder class. 

StringBuilder s = new StringBuilder();
s.Append("foo");
string a = s.ToString().SubString(0,1);

static void func(ref string bits)
    {
    StringBuilder sb = new StringBuilder();
    char Out;
    foreach (char c in bits)
        {
        if (RANDOM_NUM < MUTATION_RATE)
            {
            if (c == '1')
                Out = '0';
            else
                Out = '1';
            }
        else
            {
            Out = c;
            }
        sb.Append(Out);
        }
    bits = sb.ToString();
    }

private void button1_Click(object sender, EventArgs e)
{
//Some statements that needs to be executed on the button click
.........................................................
.........................................................

//In order to make the changes take place, I need to refresh the system from once to thrice.
}

private void Button1_Click(object sender, System.EventArgs e)    {        
SendKeys.Send("{ENTER}");    
}

SHChangeNotify(SHCNE_ASSOCCHANGED, 0, 0, 0);

[DllImport("shell32.dll")]
static extern void SHChangeNotify(uint wEventId, uint uFlags, uint dwItem1, uint dwItem2);

const uint SHCNE_ASSOCCHANGED = 0x08000000;

Invalid_Win32_app. wrote:

I am trying to refresh the machine

molesworth wrote:

What exactly do you mean by "refresh the machine"? Do you mean reboot?