You should filter the grid data in another way. The usage of Html. BeginForm is the wrong way.
Look at the answer and use either the filter toolbar or advanced searching . If you do decide to use you custom input field you should use postData with the property defined as function (see here ) and use . Trigger("reloadGrid", {page: 1}) to send the searching request to the controller.
In the case you should add new parameter which corresponds the property name in the postData to the list of parameters of GridData .
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