Hi Rupesh,

You could achive this by applying an additional filter to WebCombo based on related column when you enter edit mode. As an example, you could run the following javascript as WebGrid OnEnterEditMode client side event handler:

WebGrid_OnEnterEditMode = function (controlId, tblName, editObject){
    var cell = editObject.ToCellObject();
    if (cell.Name == "State")
    {
        if (editObject.type == "WebComboNET")
        {
            var pincode = cell.Row.GetCells().GetNamedItem("Pincode").Value;
            var webCombo = editObject.element;
            var tempValue = webCombo.Value;
            var tempText = webCombo.Text;
            if(pincode == "")
                webCombo.ClearAdditionalFilters();
            else
                webCombo.SetAdditionalFilters("[State_Pincode] = '" + pincode+ "'");
            webCombo.Value = tempValue;
            webCombo.SetText(tempText);
        }
    }
}

That should do it. Please note that setting the additional filter for the same column as DisplayMember might cause an unwanted user experience.

Best Regards,
Leo