How to calendar date select then avialable database is no display in radiobutton with asp.net

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ASP.NET4

i am using calendar date .this date select then radiobuttonlist in avialable radio button value is not display.only unavailable radio button value in database display.

select date in calendar then which value is available in database then display in radiobuttonlist .this value is exist then this radiobutton is disabled....plz help me...
Time:
10:00AM To 10:15AM
10:15AM To 10.30AM

What I have tried:

public void DataRad()
{
string q1 = "select * from Appointments_Details where ( DId='" + TextBox6.Text + "' and ADate='" + txtDate + "')";
SqlCommand cmd1 = new SqlCommand(q1, con);
con.Open();
dr = cmd1.ExecuteReader();
while(dr.Read())
{
Label7.Text = dr["ATime"].ToString();
}