Parameters Property

SqlCommand.Parameters Property

Namespace:   System.Data.SqlClient
Assembly:  System.Data (in System.Data.dll)

public SqlParameterCollection Parameters { get; }

Property Value

Type: System.Data.SqlClient.SqlParameterCollection

The parameters of the Transact-SQL statement or stored procedure. The default is an empty collection.

The Microsoft .NET Framework Data Provider for SQL Server does not support the question mark (?) placeholder for passing parameters to a SQL Statement or a stored procedure called by a command of CommandType.Text. In this case, named parameters must be used. For example:

SELECT * FROM Customers WHERE CustomerID = @CustomerID


If the parameters in the collection do not match the requirements of the query to be executed, an error may result.

For more information, see Configuring Parameters and Parameter Data Types.

The following example demonstrates how to create a SqlCommand and add parameters to the SqlParameterCollection.

private static void UpdateDemographics(Int32 customerID,
    string demoXml, string connectionString)
    // Update the demographics for a store, which is stored 
    // in an xml column. 
    string commandText = "UPDATE Sales.Store SET Demographics = @demographics "
        + "WHERE CustomerID = @ID;";

    using (SqlConnection connection = new SqlConnection(connectionString))
        SqlCommand command = new SqlCommand(commandText, connection);
        command.Parameters.Add("@ID", SqlDbType.Int);
        command.Parameters["@ID"].Value = customerID;

        // Use AddWithValue to assign Demographics.
        // SQL Server will implicitly convert strings into XML.
        command.Parameters.AddWithValue("@demographics", demoXml);

            Int32 rowsAffected = command.ExecuteNonQuery();
            Console.WriteLine("RowsAffected: {0}", rowsAffected);
        catch (Exception ex)

.NET Framework
Available since 1.1
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