Jan 14, 2016 08:52 AM|Candice Zhou|LINK
Welcome to ASP.NET Forums!
Firstly, your text boxes text size (together) must not exceed the size of the database column that you want to store their values in.
Secondly, in server page, you just have to get their values concatenated:
myText1.text + ' ' + myText2.text
You have to make sure that you use SqlCommand.Parameters to insure that you are safe from Sql Injections.
string commandText = "UPDATE YourTableName SET YourColumnName = @myPhone WHERE ...;";
SqlCommand command = new SqlCommand(commandText, connection);
command.Parameters.Add("@myPhone ", SqlDbType.Text);
command.Parameters["@myPhone "].Value = myText1.text + ' ' + myText2.text;