Hello

suppose we have some text boxes already binded with BindingNavigator how to execute an SQL query using the code so the binded data can be specified with this SQL statement

i mean i dont want to use the manual filter, want even deletinng, updating .. so on to be done with sql statements

yes you can. what I have try is add a datagridview, three textbox, one navigatorbar to the form,
I set Dataconnecion to sql server by IDE so it generate follow dataset, bindingsource and Tableadapter for me
private TestDataSet2 testDataSet2;
private System.Windows.Forms.BindingSource tBIDBindingSource;
private __11.TestDataSet2TableAdapters.TB_IDTableAdapter tB_IDTableAdapter;
I add follow at the form load event
this.tB_IDTableAdapter.Fill(this.testDataSet2.TB_ID);
this.bindingNavigator1.BindingSource = this.tBIDBindingSource;
this.textBox1.DataBindings.Add("Text", this.tBIDBindingSource, "ID", true, DataSourceUpdateMode.OnPropertyChanged);
this.textBox2.DataBindings.Add("Text", this.tBIDBindingSource, "Name", true, DataSourceUpdateMode.OnPropertyChanged);
this.textBox3.DataBindings.Add("Text", this.tBIDBindingSource, "Cost", true, DataSourceUpdateMode.OnPropertyChanged);
then all controls bind to same bindingsource
and at last if you want your operation save back to sql server , you need to add
this.tB_IDTableAdapter.Update(this.testDataSet2);
to where your operation is end