如何在组合框但不重复的C＃中设置值

Question

I have an Excel sheet and I want to fetch some data from excel to c# but the data I have is repeated in some columns.

I need select this data in combo-box but no-repeat

OleDbDataAdapter da = new OleDbDataAdapter("SELECT  TL From [Data$]", conn);
        DataTable dt = new DataTable();
        da.Fill(dt);
        comboBox2.DataSource = dt;
        comboBox2.DisplayMember = "TL";

Please help me with this code,

Thanks for all.

Answer 1

在SQL查询中使用“ DISTINCT”命令：

SELECT DISTINCT TL From [Data$]