Data Controls :: Unable To Insert Data Into Database If There Was Mobile Number?

I have 2 table in database

1-Estate_free Table

2-Black_list Table

in Register.aspx users can insert their information and when click on insertButton it insert their data into Estate_free table

below is code

  protected void insertButton_Click1(object sender, ImageClickEventArgs e)
{
SqlCommand _cmd = new SqlCommand("InsertFreeState1", _cn);
_cmd.CommandType = CommandType.StoredProcedure;
_cn.Open();

[Code].....

in above SP I define that if users tell or Mobile number was in Estate_free ro Black_list table it doesn't insert data into database and show 'You can just register 1 Time' and if there wasn't their mobile or Tell in those table it insert their data into Estate_free table and show 'You have been registered'.

problem is that when I enter data in database with new mobile number it didn't insert data in database and show 'you can just register 1 Time'.

I mean it never insert data in database.

what should i do?