C#

// Thread 1
lock (Dic1) // lock for Dic1 instance needed here? This is my question
{
Dic1.op1();
Dic1.op2();
Dic1.op3();
} // end of lock

// Thread 2
Dictionary Dic2 = new Dictionary();
Dic2.insert();
Dic2.insert();
Dic2.insert();
lock (Dic1) // need lock here?
{
Dic1 = Dic2;
} // end of lock

private void textboxInteger_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
		{			
			validate.txtIntValidate(txtPhone.text)		
		}

class Validate
    {
        public bool txtIntValidate(string txt)
        {
            if (!Char.IsDigit(e.KeyChar) && e.KeyChar != (char)8)
            {
                e.Handled = true; // input is not passed on to the control(TextBox)                
            }            
        }
    }

private void writeData()
        {
            StreamWriter writer = new StreamWriter(saveMonsterSetBase.FileName, false);

            for (int i = 0; i < MonsterSetBaseDataArray.Count; i++)
            {
                writer.Write(MonsterSetBaseDataArray[i]);
            }

            writer.Close();
        }