how can i change queryString value to (int) [duplicate]

Question

Possible Duplicate:
How can I convert String to Int?

how can i change queryString value to an (int)

string str_id;
str_id = Request.QueryString["id"];
int id = (int)str_id;

Answer 1

Use Int32.TryParse Method to get int value safely:

int id;
string str_id = Request.QueryString["id"];
if(int.TryParse(str_id,out id))
{
    //id now contains your int value
}
else
{
    //str_id contained something else, i.e. not int
}