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Source code

public void InsertRow(string myConnectionString) 
 {
    // If the connection string is null, use a default.
    if(myConnectionString == "") 
    {
       myConnectionString = "Initial Catalog=Northwind;Data Source=localhost;Integrated Security=SSPI;";
    }
    SqlConnection myConnection = new SqlConnection(myConnectionString);
    string myInsertQuery = "INSERT INTO Customers (CustomerID, CompanyName) Values('NWIND', 'Northwind Traders')";
    SqlCommand myCommand = new SqlCommand(myInsertQuery);
    myCommand.Connection = myConnection;
    myConnection.Open();
    myCommand.ExecuteNonQuery();
    myCommand.Connection.Close();
 }