Initial data commit

Task/SEDOLs/C-sharp/sedols.cs

@@ -0,0 +1,27 @@
+static int[] sedol_weights = { 1, 3, 1, 7, 3, 9 };
+static int sedolChecksum(string sedol)
+{
+    int len = sedol.Length;
+    int sum = 0;
+
+    if (len == 7) //SEDOL code already checksummed?
+        return (int)sedol[6];
+
+    if ((len > 7) || (len < 6) || System.Text.RegularExpressions.Regex.IsMatch(sedol, "[AEIOUaeiou]+")) //invalid SEDOL
+        return -1;
+
+    for (int i = 0; i < 6; i++)
+    {
+        if (Char.IsDigit(sedol[i]))
+            sum += (((int)sedol[i] - 48) * sedol_weights[i]);
+
+        else if (Char.IsLetter(sedol[i]))
+            sum += (((int)Char.ToUpper(sedol[i]) - 55) * sedol_weights[i]);
+
+        else
+            return -1;
+
+    }
+
+    return (10 - (sum % 10)) % 10;
+}