Csharp/C Sharp by API/System.Data.SqlClient/SqlParameter

new SqlParameter

<source lang="csharp"> using System; using System.Data; using System.Data.SqlClient; class MainClass {

 static void Main(string[] args)
 {
   SqlConnection cn = new SqlConnection("Data Source=(local); Initial  Catalog = MyDatabase; User ID=sa;Password=");
   SqlCommand cmd = new SqlCommand("MyStoredProcedure", cn);
   cmd.rumandType = CommandType.StoredProcedure;
   SqlParameter param = new SqlParameter("@ReturnValue", SqlDbType.Int);
   cmd.Parameters.Add(param);
   cmd.Parameters.Add("MyFirstParameter", SqlDbType.Int);
   cmd.Parameters.Add("MySecondParameter", SqlDbType.Int).Direction =
   ParameterDirection.Output;
   SqlDataAdapter da = new SqlDataAdapter(cmd);
   
 }

}

 </source>

SqlParameter.ParameterName

<source lang="csharp">

using System; using System.Data; using System.Data.SqlClient; class MainClass {

   public static void Main()
   {
       using (SqlConnection con = new SqlConnection())
       {
           con.ConnectionString = @"Data Source = .\sqlexpress;Database = Northwind; Integrated Security=SSPI";
           con.Open();
           
           string employeeID =  "5";
           string title = "Cleaner";
           
           using (SqlCommand com = con.CreateCommand())
           {
               com.rumandType = CommandType.Text;
               com.rumandText = "UPDATE Employee SET Title = @title" +
                   " WHERE Id = @Employeeid";
   
               // Create a SqlParameter object for the title parameter.
               SqlParameter p1 = com.CreateParameter();
               p1.ParameterName = "@title";
               p1.SqlDbType = SqlDbType.VarChar;
               p1.Value = title;
               com.Parameters.Add(p1);
   
               // Use a shorthand syntax to add the id parameter.
               com.Parameters.Add("@Employeeid", SqlDbType.Int).Value = employeeID;
   
               // Execute the command and process the result.
               int result = com.ExecuteNonQuery();
   
               if (result == 1)
               {
                   Console.WriteLine("Employee {0} title updated to {1}.",
                       employeeID, title);
               }
               else
               {
                   Console.WriteLine("Employee {0} title not updated.",
                       employeeID);
               }
           }
       }
   }

}

 </source>

SqlParameter.SourceVersion

<source lang="csharp">

using System; using System.Data; using System.Data.SqlClient;

  class PropagateChanges {
     static void Main(){
        string connString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
        string qry = @"select * from employee ";
        string upd = @"update employee set firstname = @firstname where id = @id";
        SqlConnection conn = new SqlConnection(connString);
        try {
           SqlDataAdapter da = new SqlDataAdapter();
           da.SelectCommand = new SqlCommand(qry, conn);
           DataSet ds = new DataSet();   
           da.Fill(ds, "employee");
           DataTable dt = ds.Tables["employee"];
           dt.Rows[0]["firstname"] = "W";
           foreach (DataRow row in dt.Rows){
              Console.WriteLine(
                 "{0} {1}",
                 row["firstname"].ToString().PadRight(15),
                 row["lastname"].ToString().PadLeft(25));
           }
           // Update employees
           SqlCommand cmd = new SqlCommand(upd, conn);
           cmd.Parameters.Add("@firstname",SqlDbType.NVarChar,15, "firstname");
           SqlParameter parm = cmd.Parameters.Add("@id",SqlDbType.Int,4,"id");
           parm.SourceVersion = DataRowVersion.Original;
           da.UpdateCommand = cmd;
           da.Update(ds, "employee");
        } catch(Exception e) {
           Console.WriteLine("Error: " + e);
        } finally {
           conn.Close();
        }
     }  
  }
  
   
 </source>

SqlParameter.Value

<source lang="csharp"> using System; using System.Data; using System.Data.SqlClient; class MainClass {

   public static void Main()
   {
       using (SqlConnection con = new SqlConnection())
       {
           con.ConnectionString = @"Data Source = .\sqlexpress;Database = Northwind; Integrated Security=SSPI";
           con.Open();
           
           string employeeID =  "5";
           string title = "Cleaner";
           
           using (SqlCommand com = con.CreateCommand())
           {
               com.rumandType = CommandType.Text;
               com.rumandText = "UPDATE Employee SET Title = @title" +
                   " WHERE Id = @Employeeid";
   
               // Create a SqlParameter object for the title parameter.
               SqlParameter p1 = com.CreateParameter();
               p1.ParameterName = "@title";
               p1.SqlDbType = SqlDbType.VarChar;
               p1.Value = title;
               com.Parameters.Add(p1);
   
               // Use a shorthand syntax to add the id parameter.
               com.Parameters.Add("@Employeeid", SqlDbType.Int).Value = employeeID;
   
               // Execute the command and process the result.
               int result = com.ExecuteNonQuery();
   
               if (result == 1)
               {
                   Console.WriteLine("Employee {0} title updated to {1}.",
                       employeeID, title);
               }
               else
               {
                   Console.WriteLine("Employee {0} title not updated.",
                       employeeID);
               }
           }
       }
   }

}

 </source>