I noticed a lot of people (like myself) were having trouble with MySql - specifically connector/net. The solution is simple, and probably affects other database storage engines just as well.
Basically - the just of it was this - here is my code to bind a DropDownList. Pretty readable stuff
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string sql = "CALL Get_LFID_info('" + ddl_Log_Formats_1.SelectedValue + "');";
DataTable dts = ExecuteMySqlAdapter(sql);
relation1.DataSource = dts;
relation1.DataTextField = "extended_varname";
relation1.DataValueField = "variable_id";
relation1.DataBind();
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The issue with this case was that my procedure calculated the result of "extended_varname" - which means that it was created by doing a SELECT CONCAT(name,".",id) sort of deal. Which meant there was no column type associated with it. The solution - pretty simple. Just cast the result. I did this - SELECT CAST(CONCAT(name,".",id) AS CHAR) AS extended_varname . While I believe that you might be able to so that simpler, it was the easy answer. If I figure out a better way to cast it, I will let you know - but the point is the general idea that the column needs to have a specific type associated with it before MySql Connector can correctly convert the rows to strings - any System.Byte[] result generally indicates a cast went wrong somewhere.
Hope that helps
-Hamy
References
mysql type conversion
