How to return multipule rows data in ADO.NET

Question

1.00/5 (2 votes)

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Hello Dear
am create a web method in Asp.net C#

C#

public static string Getdata(string Id)
       {
           string SQL = "select * from testtable where UserId='" + Id + "'";
           DataTable DATA = new DataTable();
           SqlDataAdapter DTA = new SqlDataAdapter(SQL, cnnx);
           DTA.Fill(DATA);
           if (DATA.Rows.Count > 0)
           {






           }
           return "";

This is my code
now i want to return all rows value to get value in ajax success

JavaScript

\  <script>
        $(document).ready(function () {
            $("#Btnclick").click(function () {
                $.ajax({
                    type: "POST",
                    url: "WebForm1.aspx/Getdata",
                    data: "{'Id':'" + $("#textid").val() + "'}",
                    datatype: "JSON",
                    contentType: "application/json; charset=ut-8",
                    success:function(data)
                    {
                        alert(data.d);
                       
                    },
                    error: function () {
                        alert("error");
                    }
                   

                });

            });



        });
    </script>

What I have tried:

Get all rows value and return value in ajax

Posted 12-Apr-16 10:50am

Arslan saif

Updated 12-Apr-16 19:03pm

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Comments

CHill60 12-Apr-16 17:14pm

Your datatable DTA will contain all of the rows that match that Id (as well as all of the columns on the table). If you want to return all the rows in the table then drop the where from the query.
You should also not use concatenated strings for your query, especially if Id could contain user input. User parameterised queries instead

Arslan saif 12-Apr-16 17:16pm

can you give me some code example

CHill60 12-Apr-16 18:25pm

If you want to reply to a post use the "Reply" link next to it so that the poster is notified. I've posted a solution

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CHill60 · Accepted Answer · 2016-04-12T12:24:00

To use Parameterized queries in your GetData function do something like this:

C#

public static DataTable GetSingleData(string Id)
{
    string connectionstring = Properties.Settings.Default.SandboxConnectionString;
    string SQL = "select * from testtable where UserId=@Id";
    DataTable DATA = new DataTable();
    using (var cnnx = new SqlConnection(connectionstring))
    {
        using (SqlDataAdapter DTA = new SqlDataAdapter(SQL, cnnx))
        {
            SqlParameter parm = DTA.SelectCommand.Parameters.AddWithValue("@Id", Id);
            DTA.Fill(DATA);
            if (DATA.Rows.Count > 0)
            {
                // whatever you want to do if you have rows
            }
        }
    }
    return DATA;    // Information you want will be in Row 0 (hopefully)
}

To get all the rows instead of just a single one then this is the sort of thing you need:

C#

public static DataTable GetAllData()
{
    string connectionstring = Properties.Settings.Default.SandboxConnectionString;
    string SQL = "select * from testtable"; // should really list the columns you want
    DataTable DATA = new DataTable();
    using (var cnnx = new SqlConnection(connectionstring))
    {
        using (SqlDataAdapter DTA = new SqlDataAdapter(SQL, cnnx))
        {
            DTA.Fill(DATA);
            if (DATA.Rows.Count > 0)
            {
                // whatever you want to do if you have rows
            }
        }
    }
    return DATA;    // Hopefully there will be several rows in the datatable
}

You can then get at the data in the DataTable(s) like this:
Single item

C#

var dtSingle = GetSingleData(17);
var UserName = dtSingle.Rows[0]["UserName"];

All items

C#

var dtAll = GetAllData();
foreach (DataRow dr in dtAll)
{
    var UserName = dr["UserName"];
}

OR

C#

for (int i = 0; i < dtAll.Rows.Count; i++)
{
    var UserName = dtAll[i]["UserName"];
}

(This assumes that there is a column on the database table testtable called "UserName" - replace this with whatever data you are trying to retrieve)

mohittt · Accepted Answer · 2016-04-12T19:03:00

Solution 2

From DataBase to model :- you can use DataAdapter class.
From model to ClientSide :- you can use DataSet.ToXml() function.With the help of this method you can fill your grid in client side.

Posted 12-Apr-16 19:03pm

mohittt