Assign value to string

I'm trying to assign a value to a string.....without luck....

fx.
char mystring[40];
mystring ="Something";

What is wrong....????

This Works:

Code:

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char mystring[] = "Something";

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Yes, but what if I want to change the string later on in the program????

Code:

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strcpy(String, "Hello");

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Code:

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#include <string,h>

int main()
{
  char mystr[40];
  strcpy(mystr, "The String");
  return 0;
}

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