做到这一点！ (如果您有问题，请描述一下，以便我们为您提供实际帮助)
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So do that! (If you have a problem, please describe it so we can actually help you)
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尝试

Try

private void dropdownlistbind()
    {
       
        SqlCommand cmd = new SqlCommand("Your Command using appropriate clause","Your Connection");
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds);
        DropDownList1.DataSource = ds;
        // FieldName of Table in DataBase
        DropDownList1.DataValueField = "FieldName";
        DropDownList1.DataBind();   
      }