First of all u need to install the MySql Connecter(MySql.Data).
Then add the MySql.Data , by rightClicking on References , in the Solution Explorer.
MySqlConnection conn = new MySqlConnection(ConfigurationManager.ConnectionStrings["NetsGate"].ToString());
//select data from database
MySqlCommand cmdGetData = new MySqlCommand("SELECT * FROM Employee",conn);
conn.Open();
MySqlDataAdapter daGetData = new MySqlDataAdapter(cmdGetData);
DataSet dsGetData = new DataSet();
daGetData.Fill(dsGetData);
conn.Close();
GridView1.DataSource = dsGetData;
GridView1.DataBind();
Don't forget declare the connection String in the web.Config
Place this tag within the <connectionStrings> tag in web.Config
<add name="NetsGate" connectionString="SERVER=localhost;UID=root;DATABASE=leave_mub;PASSWORD="
providerName="System.Data.SqlClient" />
Hope this will be helpfull for u guys ........................