Hi, I have problems with my Grid, when I try to fill a column I get the next error:
The callback on 'ctl00_ContentPlaceHolder1_CallbackPanel_Grid_Proyectos' has failed because the server did not recognize this callback and processed it as a normal request. This can occur if there are multiple Callback/CallbackPanel controls in the page, and this Callback/CallbackPanel control was initially dynamically loaded but wasn't loaded for this callback.
This can also occur if Response.Redirect has been called the server side, either implicitly or explicitly (usually due to user log in times out). In this case please add EO.Web.Runtime as an HttpModule in your web.config. Please see CallbackPanel documentation for more details.

When I do debug I can see that the error is for the length of my "String" of characters, Column inside of the grind is Type "String", if I cut my "String" to 200 character I don´t have problems but if my String have up 200 characters send me error.

I hope you can help me