In order to build application for DIDWW API using ASP.NET you need to construct authentication string in sha1.
The following is an example for ASP.NET:
public static string GetAsHexaDecimal(byte[] bytes)
{
StringBuilder s = new StringBuilder();
int length = bytes.Length;
for (int n = 0; n <= length - 1; n++) {
s.Append(string.Format("{0,2:x}", bytes[n]).Replace(" ", "0"));
}
return s.ToString();
}
public void Page_Load(object Sender, EventArgs E)
{
string password;
password = "
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" + "SECURITY_KEY" + "sandbox";
SHA1Managed sha = new SHA1Managed();
ASCIIEncoding ae = new ASCIIEncoding();
byte[] data = ae.GetBytes(password);
byte[] digest = sha.ComputeHash(data);
string auth_string = GetAsHexaDecimal(digest);
didww.api.didwwapi dataAPI = new didww.api.didwwapi();
//Rest of the API code...
Where
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is your username and SECURITY_KEY is your Security Key.
For further information please visit open.didww.com

How Can I Build Application for DIDWW API Using ASP.NET?