public ColumnInfo(string type, FilterInfo fi, bool index, bool unique)
 {
     //this.name = name;
     this.type = type;
     this.filterInfo = fi;
     this.index = index;
     this.unique = unique;
     this.searchable = searchable;
 }
 public ColumnInfo(string type, FilterInfo fi)
     : this(type, fi, false, false)
 {
 }
 public ColumnInfo(string type, FilterInfo fi, bool index)
     : this(type, fi, index, false)
 {
 }
 public FilterInfo(string name, bool searchable, FilterInfo.VarType type)
 {
     this.name = name;
     this.searchable = searchable;
     this.varType = (int)type;
 }