insert update delete in asp.net with c# using sql

how to use insert,update delete command in asp.net with SQL databases ,it is basics of 3 command.
link code is " using System.Data.SqlClient; "

public section is SqlCommand cmd = new SqlCommand();
SqlConnection con = new SqlConnection();
SqlDataAdapter sda = new SqlDataAdapter();
DataSet ds = new DataSet();
and connecting string is

con.ConnectionString = "Data source=DESKTOP-925FMG7;initial catalog=demo;integrated Security=true";
con.Open();

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