Question

Dim MaxItemID As Integer
Dim objCMD As New SqlCommand(StrSql, objConn)  
MaxItemID = IIf(IsDBNull(objCMD.ExecuteScalar()), 0, objCMD.ExecuteScalar()) + 1

How do I do this in C#?

Answer 1

This should do it (and avoid executing the SQL twice):

var objCMD = new SqlCommand(StrSql, objConn);
var sqlRes = objCMD.ExecuteScalar();
int maxItemID = 1 + (Convert.IsDBNull(sqlRes) ? 0 : (int)sqlRes);

Note VB will convert the object return of ExecuteScalar to an int implicitly, but C# will not.