Sqlserver column not found

Topology (); DataColumndc; dcnewDataColumn (CustomerCode); objDataTable. Columns. Add (dc); ViewState [ERPSystemApplicationTargetlist] objDataTable; DataTableo (DataTable) ViewState [ERPSystemApplication

DataTable objDataTable = new DataTable (); DataColumn dc; dc = new DataColumn ("CustomerCode"); objDataTable. columns. add (dc); ViewState ["ERPSystemApplicationTargetlist"] = objDataTable; DataTableo = (DataTable) ViewState ["ERPSystemApplication

DataTable objDataTable = new DataTable ();
DataColumn dc;

Dc = new DataColumn ("CustomerCode ");
ObjDataTable. Columns. Add (dc );

ViewState ["ERPSystemApplicationTargetlist"] = objDataTable;

DataTable o = (DataTable) ViewState ["ERPSystemApplicationTargetlist"];

String customerCode = "111 ";

O. Select ("CustomerCode =" + customerCode)

Error: the column [111] is not found.

Where is the error.