C#

[TestFixture]
public class RandomTests
{
    [Serializable]
    public class Foo : ISerializable
    {
        public bool? bn = true;
        public bool? bt = null;
        public bool? bf = null;

        public Foo()
        {
            bn = null;
            bt = true;
            bf = false;
        }

        protected Foo(SerializationInfo info, StreamingContext context)
        {
            bn = (bool?)info.GetValue("bn", typeof(bool?));
            bt = (bool?)info.GetValue("bt", typeof(bool?));
            bf = (bool?)info.GetValue("bf", typeof(bool?));
        }

        public void GetObjectData(SerializationInfo info, StreamingContext context)
        {
            info.AddValue("bn", bn);
            info.AddValue("bt", bt);
            info.AddValue("bf", bf);
        }
    }
    private SerializationInfo _info;
    private Foo foo;

    [TestFixtureSetUp]
    public void Setup()
    {
        var stream = new MemoryStream();

        var formatter = new BinaryFormatter();
        formatter.Serialize(stream, new Foo());

        stream.Seek(0, SeekOrigin.Begin);

        foo = (Foo) formatter.Deserialize(stream);
    }

    [Test]
    public void BoolFalse()
    {
        Assert.IsFalse(foo.bf.Value);
    }
    [Test]
    public void BoolTrue()
    {
        Assert.IsTrue(foo.bt.Value);
    }
    [Test]
    public void BoolNull()
    {
        Assert.IsNull(foo.bn);
    }
}

private System.Data.SqlTypes.SqlInt64 nextTaskRef()
{ 
        try
        {
                string getTaskRef = @"SELECT MAX([taskID_PK]) FROM [teamwiki].[dbo].[task];";
                SqlCommand getTaskRefSQL = new SqlCommand(getTaskRef, conAppDB);

                object rawValue = getTaskRefSQL.ExecuteScalar();
                if (rawValue != DBNull.Value) {
                    return (System.Data.SqlTypes.SqlInt64) rawValue; //if you return from this
                                                                        // point your finally block will not 
                                                                        // get executed, and becomes unreachable code
                }
        }
        catch (Exception ex) {
            throw ex; //once you throw an exception it comes out of catch block, so following code is unreachable
            return 0; //tried to return null as well unsuccessfullly
                      //this indicates an error condition 

        }
        finally {
            conAppDB.Close();
        }
        return 0; // should have return here as well, at instancecs when it reaches this point
                     // before quiting it sholud return something
    }

private System.Data.SqlTypes.SqlInt64 nextTaskRef()
{ 
        object rawValue;
        try
        {
                string getTaskRef = @"SELECT MAX([taskID_PK]) FROM [teamwiki].[dbo].[task];";
                SqlCommand getTaskRefSQL = new SqlCommand(getTaskRef, conAppDB);
                rawValue = getTaskRefSQL.ExecuteScalar();
        }
        catch (Exception ex) {
            throw ex;
        }
        finally {
            conAppDB.Close();
        }
        if (rawValue != DBNull.Value) {
             return (System.Data.SqlTypes.SqlInt64) rawValue;
        }
        return 0;
}

return (System.Data.SqlTypes.SqlInt64) rawValue;

if (rawValue != DBNull.Value) {
   return (System.Data.SqlTypes.SqlInt64) rawValue;
}
else {
   return 0;
}

private static readonly int MinValue = 0;
private static readonly int MaxValue = 100;
int textBox1Value;
int textBox2Value;
bool textBox1Valid;
bool textBox2Valid;
private void textBox1_Validating(object sender, CancelEventArgs e)
{
    if (!ValidateTextBoxes() && !textBox1Valid)
    {
        e.Cancel = true;
        textBox1.SelectAll();
    }
}
private void textBox2_Validating(object sender, CancelEventArgs e)
{
    if (!ValidateTextBoxes() && !textBox2Valid)
    {
        e.Cancel = true;
        textBox2.SelectAll();
    }
}
private bool ValidateTextBoxes()
{
    textBox1Valid = int.TryParse(textBox1.Text, out textBox1Value);
    textBox2Valid = int.TryParse(textBox2.Text, out textBox2Value);
    if (textBox1Valid)
        textBox1Valid = textBox1Value >= MinValue && textBox1Value <= MaxValue;
    if (textBox2Valid)
        textBox2Valid = textBox2Value >= MinValue && textBox2Value <= MaxValue;
    SetResultLabel(textBox1Valid && textBox2Valid);
    return textBox1Valid && textBox2Valid;
}
private void SetResultLabel(bool validated)
{
    if (validated)
        label1.Text = string.Format("{0}:{1}", textBox1Value, textBox2Value);
    else
        label1.Text = string.Empty;
}

Can Selçik wrote:

I have searched CodeProject and Google but I couldn't see a satisfacting answer

Olav Alexander Mjelde wrote:

So, then I made this thread on tek-tips and a person there gave me a suggestion that maybe my application triggers too fast (eg. tries to use the clipboard, befire it's filled).

Olav Alexander Mjelde wrote:

I then tried a thread.sleep(1000)..