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DateTime startTime=DateTime(em_1.Text)
DateTime endTime=DateTime(em_2.Text)

string sql
sql = dw_1.GetSQLSelect()+"Where (StartTime> '"+startTime+"') and (EndTime < '"+endTime+"')"

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C# code:
string sql = xx + " where startTime > @startTime and EndTime < @endTime";
SqlCommand cmd = new SqlCommand(sql,con);
cmd.Parameters.Add("@startTime",SqlDbType.DateTime);
cmd.Parameters.Add("@endTime",SqlDbType.DateTime);

cmd.Parameters["startTime"].Value = xx;
cmd.Parameters["endTime"].Value = xx;

cmd.ExecuteNonQuery();


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DateTime startTime=DateTime(em_1.Text)
DateTime endTime=DateTime(em_2.Text)

--MSSQL
string sql
sql = dw_1.GetSQLSelect()+" Where (StartTime> '"+em_1.Text+"') and (EndTime < '"+em_2.Text+"')"

SQL code



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