postgresql 9.3 - I can't insert data from text boxes into postgre sql table using C# -

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and here code

public partial class form2 : form    {         npgsqlconnection conn;         npgsqlcommand cmd;         string connstring = configurationmanager.connectionstrings["employeedata"].connectionstring;         private dataset ds = new dataset();         private datatable dt = new datatable();          public form2()         {             initializecomponent();             lblerrormessage.visible = false;         }           string employee = "insert  vsp_employee values ('" + txtempid.text + "','" + txtempname.text + "','" + txtemailid.text + "','" + txtphnum.text + "','" + txtdob.text + "','" + txtdoj.text + "','" + txtnod.text + "','" + txtsalary.text + "','" + txtleavestaken.text + "','" + txtleavesbalance.text + "')";         npgsqldataadapter da = new npgsqldataadapter(employee, conn);         cmd = new npgsqlcommand(employee, conn);         da = new npgsqldataadapter(cmd);         ds = new dataset();         da.fill(ds);


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