Insertion Od Data In The Table

Hi Friends,
I have 3 labels Steet,City,Pincode and 3 textboxes related to the labels and one button as nae 'Address'
I gave the data for Street:abc,City:xyz,Pincode:123 and have to insert into the table.I created one table in the database with table name Adreess and column address varchar(100)
but after giving the values in the textboxes and clicked on the button its throwing the exception i.e
System.Data.SqlClient.SqlException: The name "abcxyz123" is not permitted in
this context. Valid expressions are constants, constant expressions, and (in
some contexts) variables. Column names are not permitted.
I wrote the code like following
 protected void Button1_Click(object sender, EventArgs e)
    {
        string street = txtStreetNo.Text;
        string city = txtCity.Text;
        string pincode = txtPincode.Text;
        string com = street + city+pincode;
        conn.Open();
        SqlDataAdapter daInsert = new SqlDataAdapter("insert into Address values(" + com.ToString() + ")", conn);
        daInsert.SelectCommand.ExecuteNonQuery();--->here its giving the exception
        conn.Close();
        Response.Write("the values are inserted");
        

    }
Please any one tell me am I did the code write or not if its not please give any suggetions
thanks
Geeta