public enum ModuleType
    {
        None = 0,
        DiscsystemManager = 1,
        ImageTextInfoManager = 2
    }

public enum ModuleType
{
    None = 0,
    DiscsystemManager = 1,
    ImageTextInfoManager = 2
}
private void button2_Click(object sender, EventArgs e)
{
    ModuleType mt = (ModuleType)0;
    Console.WriteLine(mt);
}

------解决方案--------------------
 ModuleType m = (ModuleType)2;

------解决方案--------------------
探讨

 ModuleType m = (ModuleType)2;


------解决方案--------------------
数据库表A,假设C#实体名也为A,字段tinyint;则
C# code

public enum ModuleType
{
    None = 0,
    DiscsystemManager = 1,
    ImageTextInfoManager = 2
}
private void button2_Click(object sender, EventArgs e)
{
    ModuleType mt = (ModuleType)(A.tinyint);
    Console.WriteLine(mt);
}