ERROR:Operation is not valid due to the current state of the object.

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ERROR:Operation is not valid due to the current state of the object. 

When you send more than 1000 control within a single post request then this type of error will occur

Solution:

 Add an appsetting in WebConfig: 
<appSetting>

 <add key="aspnet:MaxHttpCollectionKeys" value="20001"/> 

//in the value field put the number of controls you want to send in post request for example-20001.

 </appSetting>

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