我如何在标签中写上计数数字? [英] how i write the count number in a lable?

问题描述

我使用以下代码来计算MSSQL 2005 DB中表中的行数.
但是，我应该如何编写C#代码来获取数字?

I use the following code to count the number of rows in a table in MSSQL 2005 DB.
But, how should I write the C# code to get the number?

SqlConnection objcon = new SqlConnection();
            objcon.ConnectionString = "Data source=localhost; Initial catalog=BRIDGES_DB; User ID=sa; password=123;";
            SqlCommand objcom = new SqlCommand();
            objcom.CommandType = CommandType.Text;
            objcom.CommandText = "SELECT COUNT(marks_org) FROM activity_result";
            objcom.Connection = objcon;
            objcon.Open();
            if (dr.Read())
            {

               Label1.Text=?

            }
            objcon.Close();

推荐答案

您可以通过执行以下操作找到该值:

You would find the value by doing the following:

Label1.Text = dr[0].ToString();

但是，我在任何地方都看不到dr的定义.确保您正在执行以下操作:

However, I don''t see dr defined anywhere. Make sure you are doing the following:

SqlDataReader dr = objcom.ExecuteReader();

在执行if语句之前.

这是一个有效的教程，可以为您指明正确的方向:
http://www.akadia.com/services/dotnet_data_reader.html [

before you do the if statement.

Here is a working tutorial that will point you in the right direction:
http://www.akadia.com/services/dotnet_data_reader.html[^]

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