Fix invalid syntax in samples (#3726)

Author: ErikEJ

doc/samples/SqlCommand_ExecuteXmlReader.cs

@@ -3,7 +3,7 @@
 using System.Data;
 using Microsoft.Data.SqlClient;
 
-private static void CreateXMLReader(string queryString,
+static void CreateXMLReader(string queryString,
     string connectionString)
 {
     using (SqlConnection connection = new SqlConnection(

doc/samples/SqlConnection_Pooling_Use_Statement.cs

@@ -5,15 +5,15 @@ class Program
 {
     static void Main()
     {
-        string connectionString = "Server=localhost;Database=master;Integrated Security=true;"
+        string connectionString = "Server=localhost;Database=master;Integrated Security=true;";
         // <Snippet1>
         // Assume that connectionString connects to master.  
         using (SqlConnection connection = new SqlConnection(connectionString))
         using (SqlCommand command = new SqlCommand())
         {
             connection.Open();
             command.Connection = connection;
-            command.Text = "USE DatabaseName";
+            command.CommandText = "USE DatabaseName";
             command.ExecuteNonQuery();
         }
             // </Snippet1>