Edit On DataBound Datagridview

[maheshwag]

I have Populate Datagridview by Follow:

string constr = "server=.;initial catalog=Database;uid=uid;pwd=pwd";
            SqlConnection con = new SqlConnection(constr);
            con.Open();
 
            string sql = " select srno,description,pcs,carat,rate,amount from invcarat where " +
                       " invno= ('" + textBox1.Text + "') and companyID=('" + label1.Text + "')";
            SqlCommand cmd = new SqlCommand(sql, con);
            SqlDataAdapter dap = new SqlDataAdapter(cmd);
            mydataset = new DataSet();
            dap.Fill(mydataset);
            bindingsource1 = new BindingSource();
            bindingsource1.DataSource = mydataset;
            bindingsource1.DataMember =      mydataset.Tables[0].TableName;
            newdgv.DataSource = bindingsource1;
 
 
 

It works fine and display all the data but problem is that it not allow me to edit directly.
Suppose If I want to edit srno columns first row than it wan’t allow and when I move to down row and then again come to same row than it allow me to edit.
Why it not allow me to edit directly. Why I have to move to down row and come againt same row to edit?.