try this code for binding to database and insert into it:
SqlConnection conn = new SqlConnection();
conn.ConnectionString = ConfigurationManager.ConnectionStrings["Your ConnectionString name"].ConnectionString;
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
conn.Open();
try
{
cmd.CommandText = "Insert into [Database Name] values([your Field Name that you want to insert from Textbox])";
cmd.Parameters.Add("@Your FieldName", SqlDbType.VarChar).Value = textbox1.Text;
cmd.ExecuteNonQuery();
}
catch (SqlException se)
{
Page.Title = "Exception :" + ex.Message;
}
finally
{
conn.Close();
}