ASP.NET Insert Data - Dropdownlist Condition

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C#

ASP.NET

hello,

i have asp.net project which has dropdownlist. i need to insert data into my database according to dropdownlist condition.

For example; in my project, i will choose the employee and i will insert the some values from my textboxes and after clicking button on the bottom, i need to insert the changes into database that selected employee from my dropdownlist.

Here is the button click codes;

 protected void Button2_Click(object sender, EventArgs e)
{
   SqlConnection conn;
   SqlCommand cmd = new SqlCommand();
   string strSQL = "Insert INTO info (day,event) Values (@day,@event)";
   string bag_str = WebConfigurationManager.ConnectionStrings["asgdb01ConnectionString"].ConnectionString;
   conn = new SqlConnection(bag_str);
   conn.Open();
   cmd.Connection = conn;
   cmd.CommandText = strSQL;
   cmd.Parameters.Add
   cmd.Parameters.Add(new SqlParameter("@day", TextBox1.Text));
   cmd.Parameters.Add(new SqlParameter("@event", TextBox2.Text));
   int i = cmd.ExecuteNonQuery();
   conn.Close();
   if (i > 0)
      Response.Write("Data Inserted");
   else
      Response.Write("Try Again");
}

Waiting your helps. I looked around too much but couldnt see the example or idea like that.
Please i need your helps.
Thanks.

edit 1
The answer is nearly found.Thanks for your answer. But here is the problem. This commands adds new rows into my table, i need to insert an existing row.

Here something to make your mind clear;

i have penalties table which includes that columuns ;

[ID],[NAME],[TYPE],[MON],[TUE],[WED],[THU],[FRI],[SAT],[SUN],[TOTAL],[DAY],[P1],[P2],[OVER].

Includes ;

ID NAME TYPE MON TUE....SUN TOTAL DAY P1 P2 OVER DATE

-------------------------------------------------------------------

1 mike out 250 350..... 0 900 - - - - 22-06-2012

2 john in 350 150 ....100 1100 - - - - 28-06-2012

As you see from here my friend, i will choose the dates from my datetimepickers, i will choose the employee from my dropdownlist and i will enter the values into textboxes and after that i will click finish button.

the day,p1,p2 and over values must be inserted into that chosen employee.

waiting your answer please, i need it too badly..

thanks.