c# - 找不到类型或名称空间名称“ MySql”（您是否缺少using指令或程序集引用？）c＃VS 2013

[英]c# Error 1 The type or namespace name '' could not be found (are you missing a using directive or an assembly reference?)

[英]C#:The type or namespace name '?Attribute' could not be found (are you missing a using directive or an assembly reference?

[英]The type or namespace name 'ScriptName' could not be found (are you missing a using directive or an assembly reference?) fix unity c#

[英]C#: The type or namespace name 'class' could not be found(are you missing a using directive for an assembly reference?)

[英]CS0246: The type or namespace name 'MySql' could not be found (are you missing a using directive or an assembly reference

[英]C# Error CS024 The type or namespace name 'Form1' could not be found (are you missing a using directive or an assembly reference?)

[英]C# Error: Error CS0246 The type or namespace name '' could not be found (are you missing a using directive or an assembly reference?)

[英]CS0246 C# The type or namespace name 'ForeignKeyAttribute' could not be found (are you missing a using directive or an assembly reference?)

[英]How to fix C# error “The type or namespace name '[x]' could not be found (are you missing a using directive or an assembly reference?)”

[英]C# error CS0246 The type or namespace name 'Socket' could not be found (are you missing a using directive or an assembly reference)

找不到类型或名称空间名称“ MySql”（您是否缺少using指令或程序集引用？）c＃VS 2013