fill gridview from datareader

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Hello guys,

I developed a desktop application and I want to generate a SqlDataReader to fill the gridview.

the is class

C#

class operation{
SqlConnection con = new SqlConnection(Connection.connectionString);
        SqlCommand com = new SqlCommand();
public SqlDataReader rd;

        public SqlDataReader getdata(string query)
        {
            com.CommandText = query;
            com.Connection = con;
            con.Open();
            rd = com.ExecuteReader();

            con.Close();
            return rd;      
        }
}

and the button to generate

 private void button2_Click(object sender, EventArgs e)
{
           oper.getdata("Select * From Customers");
           rd = oper.rd;
           if (rd.HasRows)
           {
               while (rd.Read())
               {

               }
           }
           con.Close();
       }

I have a lot of errors. I hope to find the answer.

Thanks a lot!

Posted 6-Nov-13 9:05am

beljk

Updated 6-Nov-13 9:43am

Richard C Bishop

v2

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Comments

Richard MacCutchan 6-Nov-13 16:50pm

I have a lot of errors
Well I'm afraid my mind reading skills are a bit rusty; care to tell us what they are?

beljk 6-Nov-13 19:55pm

First , i want when i click on the button , fill all data from the customer table in the gridview by using sqlreader but i don't know how , so this is my simple code i think that's need something like in the while loop , and is the method right or wrong ??? i hope to understand me

Richard MacCutchan 7-Nov-13 5:00am

Take a look at this article on the use of datareaders. You may also like to study the dataadapter class on MSDN.

2 solutions

Solution 1

Hi Please try this

C#

protected void button2_Click(object sender, EventArgs e)
  {
  SqlDataReader sqlDataReader = GetData(query, conString);//conString is Connection String
  }

And 'GetData' method is as below

public SqlDataReader GetData(string queryString, string connectionString)
    {

        SqlConnection connection = new SqlConnection(connectionString);
            connection.Open();
            SqlCommand command = new SqlCommand(queryString, connection);
            SqlDataReader reader = command.ExecuteReader();
            SqlDataReader sqlDataReader = reader;
            DataTable dataTable = new DataTable();
            dataTable.Columns.Add("Customer Id");
            dataTable.Columns.Add("Customer Name");
            while (sqlDataReader.Read())
            {
                DataRow row = dataTable.NewRow();
                row["Customer Id"] = sqlDataReader["CustomerId"];
                row["Customer Name"] = sqlDataReader["CustomerName"];
                dataTable.Rows.Add(row);
            }
            GridView1.DataSource = dataTable;
            GridView1.DataBind();
            connection.Close();
        return reader;  
    }

Hope it will helpful. Mark question as solved after trying.
--
Thanks

Posted 6-Nov-13 19:18pm

member 8888995

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sankarsan parida · Accepted Answer · 2013-11-06T20:06:00

SqlDataReader objects allow you to read data in a fast forward-only manner. Call the Close method of the SqlDataReader to ensure there are not any resource leaks.

C#

private void BindGrid()
{
    string strConnString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(strConnString))
    {
        using (SqlCommand cmd = new SqlCommand())
        {
            cmd.CommandText = "select * from Customers";
            cmd.Connection = con;
            con.Open();
            DataGridView1.DataSource = cmd.ExecuteReader(); 
            con.Close();
        }
    }
}