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How to add a column when using SqlDataAdapter to fill a datagridview

I am using SQL to fill my datagridview. I am doing that this way:
string cn = ConfigurationManager.ConnectionStrings["Scratchpad"].ConnectionString;
SqlConnection myConnection = new SqlConnection(cn);
string sql = "some text here";
SqlDataAdapter dataadapter = new SqlDataAdapter(sql, myConnection);
DataSet ds = new DataSet();
myConnection.Open();
dataadapter.Fill(ds, "Authors_table");
myConnection.Close();
dataGridView1.DataSource = ds;
dataGridView1.DataMember = "Authors_table";
Now it deletes the old datagridview and paste the selection. But I want just to add the data to the column right of the existing data.
Thanks in advance

This requirement sounds like it could be met with a SQL Inner Join in the query you're using in your SqlDataAdapter. If you were able to join your two data sources together on matching keys, you could simply pull the data down once. But I'm going to assume there's some reason why that won't work for you.
You can in fact do what you want with a DataSet, but you'll need to take a few more steps:
string sql = "The first query"
SqlDataAdapter dataadapter = new SqlDataAdapter(sql, myConnection);
DataSet ds = new DataSet();
myConnection.Open();
dataadapter.Fill(ds, "Authors_table");
myConnection.Close();
// I don't know what your primary key is, but you need to have one.
// I am assuming it's called "author_id".
DataColumn authorIdColumn = ds.Tables["Authors_table"].Columns["author_id"];
ds.Tables["Authors_table"].PrimaryKey = new[] { authorIdColumn };
// Get your second set of data
sql = "My second query, which also has the same primary key, but has more columns"
dataadapter = new SqlDataAdapter(sql, myConnection);
dataadapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
DataSet ds2 = ds.Clone();
myConnection.Open();
dataadapter.Fill(ds2, "Authors_table");
myConnection.Close();
// Now we use the DataSet.Merge method, which is very powerful.
ds.Merge(ds2, false, MissingSchemaAction.AddWithKey);
dataGridView1.DataSource = ds;
dataGridView1.DataMember = "Authors_table";
You may have to experiment with that a lot: this is just the outline. Without knowing your data and what you do up to this point, it's hard to know what settings or methods you might also need to call.

Try this. I ran multiple queries in one go
SqlDataAdapter adapter = new SqlDataAdapter(
"SELECT * FROM Customers; SELECT * FROM Orders", connection);
adapter.TableMappings.Add("Table", "Customer");
adapter.TableMappings.Add("Table1", "Order");
adapter.Fill(ds);

Dataset filter method

Here is my code,
Conn.Open();
DataTable dt = new DataTable();
DataSet ds = new DataSet();
SqlCommand sqlCmd = new SqlCommand("SELECT * from CurrentDataCR ",Conn);
SqlDataAdapter sqlDa = new SqlDataAdapter(sqlCmd);
sqlDa.Fill(ds);
ds.Tables[0].DefaultView.RowFilter = " mst_remote_station_id Like'*9001*'";
Here I am getting Complete row for id 9001. I need only one column value for this id.

DataRow[] rows = ds.Tables[0].Select("mst_remote_station_id Like '%9001%'");
You can do it this way also if you need only one row just select it in the initial query.
Also you should Dispose the SqlDataAdapter after using it ! You can do it with using block
Conn.Open();
DataSet ds = new DataSet();
SqlCommand sqlCmd = new SqlCommand("SELECT * from CurrentDataCR ",Conn);
using(SqlDataAdapter sqlDa = new SqlDataAdapter(sqlCmd))
{
sqlDa.Fill(ds);
}
ds.Tables[0].Select("mst_remote_station_id Like '%9001%'");
I don't know if the connection is global but it is bad practice to use global connection, you have connection pool so use separate connection for every query.

DataAdapter.Fill(), Error arise as "Incorrect syntax near ')'"

When retrieving a datatable from database using the following code in ASP.Net & C#:
The database is located in my local machine.
string connectionString = #"Data Source=CCS90; Initial Catalog=Ribo; Trusted_Connection=True;";
SqlConnection myConn = new SqlConnection(connectionString);
myConn.Open();
SqlCommand sqlCommand = new SqlCommand("SELECT * FROM PUR_POHEADER WHERE POID = #POID", myConn);
sqlCommand.Parameters.Add("#POID", SqlDbType.Int);
sqlCommand.Parameters["#POID"].Value = Convert.ToInt32(request.ReferenceNo);
DataSet DS = new DataSet();
SqlDataAdapter AD = new SqlDataAdapter(sqlCommand, myConn);
//AD.Fill(DS);
AD.Fill(DS, "POTABLE"); //Error arise at this place
DataTable DT = DS.Tables[0];
myConn.Close();
When compiler comes to the line AD.Fill(DS, "POTABLE");, error occurs at Incorrect syntax near '). What may be the reason?

You create a SqlCommand with a SELECT statement and then you don't use it. What is insertStatement? Surely you should be using sqlCommand.

You may try with
AD.Fill(DS);
instead of
AD.Fill(DS,"PORTABLE");
Also try:
SqlDataAdapter AD = new SqlDataAdapter(sqlCommand);
instead of
SqlDataAdapter AD = new SqlDataAdapter(insertStatement, myConn);

Problem is here:
SqlDataAdapter AD = new SqlDataAdapter(insertStatement, myConn);
replace it with:
SqlDataAdapter AD = new SqlDataAdapter(sqlCommand);
and also you are using this overload i think:
AD.Fill(DS, "NameOfDataTable");
then you can access it like this:
DataTable DT = DS.Tables["NameOfDataTable"];
insetad of using 0 index.

data binding for gridview

I'm trying to bind my sql table with the grid view using the following code:
string connectionString = WebConfigurationManager.ConnectionStrings["Gen_Lic"].ConnectionString; //<-- error
string selectSQL = "SELECT * FROM Gen_Lic";
SqlConnection con = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand(selectSQL, con);
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
adapter.Fill(ds, "Gen_Lic");
Gen_Lic_Grid.DataSource = ds;
Gen_Lic_Grid.DataBind();
But I don't know where I'm going wrong with this, but I'm getting an error:
Object reference not set to an instance of an object.
Any suggestions?
This is my web.config file:
<connectionStrings>
<add name="Gen_LicConnectionString" connectionString="Data Source=ESHA\SQLEXPRESS;Initial Catalog=Gen_Lic;User ID=sa;Password=sa#" providerName="System.Data.SqlClient" />
</connectionStrings>

Use this link to add connection string in web config.
http://www.aspdotnet-suresh.com/2011/11/write-connection-strings-in-webconfig.html
you were using a different name in the call and webconfig.
string connectionString = ConfigurationManager.ConnectionStrings["Gen_LicConnectionString"].ConnectionString;

You didn't open SqlConnection. you have to Open Connection before creating a command variable.
string connectionString = WebConfigurationManager.ConnectionStrings["Gen_Lic"].ConnectionString; //<-- error
string selectSQL = "SELECT * FROM Gen_Lic";
SqlConnection con = new SqlConnection(connectionString);
con.Open();// Need to Open Connection before to Create SQL Comamnd
SqlCommand cmd = new SqlCommand(selectSQL, con);
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
adapter.Fill(ds, "Gen_Lic");
Gen_Lic_Grid.DataSource = ds;
Gen_Lic_Grid.DataBind();

Always check your connection string and set the connection to open.
to make it safe, set always your connection to close.
if(connection.State == ConnectionState.Open)
connection.Close();
connection.Open();

Return Null Data

SqlConnection con = new SqlConnection("Data Source=MOSTAFA;Initial Catalog=mohasba;Integrated Security=True");
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = con.CreateCommand();
da.SelectCommand.CommandText = "select sum(مدين) AS مدين,sum (دائن) AS دائن from اذن_قيد where اسم_البيان='" + comboBox1.SelectedIndex + "'";
da.Fill(ds, "اذن_قيد");
dataGridView1.DataSource = ds;
dataGridView1.DataMember = "اذن_قيد";
When i use this code, it return null data
But When i use this command in sql server "Return Data"

I dont think there is any error with the code above.
What you can try is, First of all make sure that the connection string you are using can access the database.
Secondly, since you are using some kind of language coallation in your sql server queries, make sure that ASP.NET recongnizes the query and sends them to the sql server in the appropiate coallation.
Hope this helps.