what did you try so far?
there is no problem in having the table name coming from a DropDown, it’s more about understanding and designing the Data Access layer for your application. Do you have a save button in your WebForm and are you composing the SQL code dynamically in the code behind or using stored procedures?
starting point to connect to SQL Server and execute a command is generally similar to the following (if you do not use ORM like Entity Framework):
using (varconn = new SqlConnection(connectionString))
using (var cmd = conn.CreateCommand(...)))
{
conn.Open();
cmd.ExecuteNonQuery();
}
if you need more ideas about how to use EF (or simply a DAL technique) with ASP.NET (MVC or Web Forms), see my answer here: https://stackoverflow.com/a/7474357/559144
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solved Insert values into the table depending on the selected dropdown value