SPSowndaiyan Paulpandi Syncfusion Team November 5, 2015 05:17 PM UTC
Sorry for the delay caused.
We have analyzed your query with your provided code example. In GridDataControl, the property that you have used in ValueMember should be the same type of the property that you have used for MappingName. And also the corresponding value that you loaded in MappingName property should be present in the collection of ValueMember property. For you reference we have prepared a sample with DisplayMember and ValueMember in ComboBoxColumn and you can download the sample form the following location,