How to set auto values for ranking table?

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Hi I am tring to set an auto numbered rank to a table so as the top scorer will be ranked 1st and so on. I have got a DataTable but it is not ordered by points as is in the GridView.
there is a way to order a DataTable so I can set auto rank? or by different way?

Here is what I tried:
Rank.asx.cs

C#

protected void Page_Load(object sender, EventArgs e)
{
    MyAdoHelper.SetRanks("db.mdf", "select player from ranking");
}

MyAdoHelper.cs

C#

public static void SetRanks(string fileName, string sql)
     {

        DataTable dt = ExecuteDataTable(fileName, sql);//gives the DataTable
        int rank = 1;
        string player = "";
        foreach (DataRow row in dt.Rows)
        {
            foreach (object myItemArray in row.ItemArray)
            {
                player = myItemArray.ToString();
                string sqlrank="update ranking set rank='"+rank+"' where player='"+player+"'";
                MyAdoHelper.DoQuery("db.mdf", sqlrank);
                rank++;
            }
        }
    }

Any ideas?

Thanks in advance :D

Posted 3-Jun-11 5:14am

Member 7966831

Updated 3-Jun-11 5:19am

Sandeep Mewara

v2

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Comments

Sandeep Mewara 3-Jun-11 11:19am

Formatting the code part by PRE tag makes the question readable. Please use it from next time.

OriginalGriff 3-Jun-11 12:17pm

Answer updated

2 solutions

Solution 2

Thank you for that nice solution!
(here is the final version)

Rank.aspx.cs

C#

protected void Page_Load(object sender, EventArgs e)
{
    MyAdoHelper.SetRanks("db.mdf", "select player, allPoints from ranking");
}

MyAdoHelper.cs

    public static void SetRanks(string fileName, string sql)    
{
        DataTable dt = ExecuteDataTable(fileName, sql);//gives the DataTable
        int rank = 1;
        string player = "";
        DataView dv = new DataView(dt, "","allPoints DESC", DataViewRowState.CurrentRows);
        foreach (DataRowView dr in dv)
        {
            DataRow row = dr.Row;
            int num = 1;
            foreach (object myItemArray in row.ItemArray)
            {
                if (num == 1)//if it checks the 'player' field
                {
                    player = myItemArray.ToString();
                    string sqlrank = "update ranking set rank='" + rank + "' where player='" + player + "'";
                    MyAdoHelper.DoQuery("db.mdf", sqlrank);
                    rank++;
                    num++;
                }
            }
        }
    }

Posted 3-Jun-11 6:59am

Member 7966831

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OriginalGriff · Accepted Answer · 2011-06-03T06:14:00

Construct a DataView, and give it a column name to sort on:

C#

public static void SetRanks(string fileName, string sql)
     {

        DataTable dt = ExecuteDataTable(fileName, sql);//gives the DataTable
        int rank = 1;
        string player = "";
        DataView dv = new DataView(dt, "", "rank", DataViewRowState.CurrentRows);
        foreach (DataRowView dr in dv)
        {
            DataRow row = dr.Row;
            foreach (object myItemArray in row.ItemArray)
            {
                player = myItemArray.ToString();
                string sqlrank="update ranking set rank='"+rank+"' where player='"+player+"'";
                MyAdoHelper.DoQuery("db.mdf", sqlrank);
                rank++;
            }
        }
    }

[edit + edit2]For some weird reason, the code disappeared when I pressed submit... - OriginalGriff[/edit + edit2]