// This example needs the
// System.Data.SqlClient library
#region Building the connection string
string Server = "localhost";
string Username = "my_username";
string Password = "my_password";
string Database = "my_database";
string ConnectionString = "Data Source=" + Server + ";";
ConnectionString += "User ID=" + Username + ";";
ConnectionString += "Password=" + Password + ";";
ConnectionString += "Initial Catalog=" + Database;
#endregion
#region Try to establish a connection to the database
SqlConnection SQLConnection
= new SqlConnection
();
try
{
SQLConnection.ConnectionString = ConnectionString;
SQLConnection.Open();
// You can get the server version
// SQLConnection.ServerVersion
}
catch (Exception Ex)
{
// Try to close the connection
if (SQLConnection != null)
SQLConnection.Dispose();
// Create a (useful) error message
string ErrorMessage = "A error occurred while trying to connect to the server.";
ErrorMessage += Environment.NewLine;
ErrorMessage += Environment.NewLine;
ErrorMessage += Ex.Message;
// Show error message (this = the parent Form object)
MessageBox.Show(this, ErrorMessage, "Connection error", MessageBoxButtons.OK, MessageBoxIcon.Error);
// Stop here
return;
}
#endregion
#region Execute a SQL query
string SQLStatement = "SELECT * FROM ExampleTable";
// Create a SqlDataAdapter to get the results as DataTable
SqlDataAdapter SQLDataAdapter
= new SqlDataAdapter
(SQLStatement, SQLConnection
);
// Create a new DataTable
DataTable dtResult
= new DataTable
();
// Fill the DataTable with the result of the SQL statement
SQLDataAdapter.Fill(dtResult);
// Loop through all entries
foreach (DataRow drRow in dtResult.Rows)
{
// Show a message box with the content of
// the "Name" column
MessageBox.Show(drRow["Name"].ToString());
}
// We don't need the data adapter any more
SQLDataAdapter.Dispose();
#endregion
#region Close the database link
SQLConnection.Close();
SQLConnection.Dispose();
#endregion
