Can't add MySql to C# program (reference and "using" already added) -

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i'm writing c# program in visual studio 2010 excel macro. i'm attempting connect program mysql database. when try build, errors following:

the type or namespace name 'mysql' not found (are missing using directive or assembly reference?)

the type or namespace name 'mysqlconnection' not found (are missing using directive or assembly reference?)

i have downloaded .net mysql connector , added visual studio reference mysql.data.dll, , have "using mysql.data.mysqlclient;" @ top of program. these 2 things seem hangups else on internet sees these errors.

why else getting these errors, , how can resolve them?

edit: also, when type using statement, ide not autocomplete mysql me; doesn't seem know what/where is.

apart using statement, shown above, errors when trying use mysqlconnection, e.g. below

public dictionary <string, mysqlconnection> m_envtocon;

i've encountered error , had explicitly remove connection name before devenv build.

  <remove name="connectionname" />

add above statement before connection add tag

  <connectionstrings>     <remove name="mysql" />     <add name="mysql" connectionstring="..." />     <remove name="mysqlconnection" />     <add name="mysqlconnection" connectionstring="..." />   </connectionstrings>

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