how to select one record by two field

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Hi my Friends.
1.I have 3 fields : 1. year 2. month 3.price
2.I have two TextBox for year and price and a DropDownList for select a month
3.now I want to select or search a one and only one record by selecting value from DropDownList and year and want to show in GridView
now my problem is that I don't know how to set query for this
this is my code that don't work:

protected void Button5_Click(object sender, EventArgs e)
    {
        String cstr = @"Data Source=FAZI-PC\REZA_FAZI;Initial Catalog=ejra_db;Integrated Security=True";
        SqlConnection scon = new SqlConnection(cstr);
        connection.Open();
        String searchstr = String.Format("SELECT * From shakhes WHERE year,month={0}'{1}'",
                                           TextBox3.Text,DropDownList1.SelectedIndex);
                                      
        SqlCommand searchcmd = new SqlCommand(searchstr,scon);
        SqlDataReader dr = searchcmd.ExecuteReader();

        if (dr.HasRows)
        {
            dr.Read();
            TextBox4.Text=dr["price"].ToString();
            int ddl = Int32.Parse(dr["month"].ToString());
            DropDownList1.SelectedIndex = ddl;
        }
        else 
        {
            Label6.ForeColor = Color.Red;
            Label6.Text = "there is no data";
        }
        dr.Close() ;
        connection.Close();
    }

please help me

Posted 12-Oct-15 9:17am

rezaeti

Updated 12-Oct-15 9:32am

v2

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rezaeti 12-Oct-15 15:44pm

the error :
An expression of non-boolean type specified in a context where a condition is expected, near ','.

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OriginalGriff · Answer 1 · 2015-10-12T09:43:00

For starters, don't do it like that!
Concatenating strings took form an SQL command is an invitation to SQL Injection, which can damage or destroy your database.
Try:

C#

string searchstr = string.Format("SELECT * From shakhes WHERE year = @YR AND month=@MN";
SqlCommand cmd = new SqlCommand(searchstr,scon);
cmd.Parameters.AddWithValue("@YR",x3.Text);
cmd.Parameters.AddWithValue("@MN",DropDownList1.SelectedIndex);

Abhinav S · Answer 2 · 2015-10-12T20:08:00

The result will depend on your query.
If the same record is returned you could use the DISTINCT keyword.
If you just want the top most record use TOP keyword.

Last but not least filter your query on the primary key so you get a single record.
Of course, your user would not know the primary key unless it is a user defined field.

how to select one record by two field

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