VB.NET 2008, datagrid query

[nerden]

Hi,

I’m writing a programme in VB.NET 2008 which uses an access database; I am trying to create a query which uses the value from a textbox say txtStudentNo, to query a DataGridView say grdInfo to only show the student with the entered student number.

The problem I am having is that I can make a query and make it run correctly if the student number is applied in the actual query using the QueryBuilder, however I can not work out how to make said query look at a textbox. Everything I have found so far has been for VB.net 05 and 03, these have all said I need to use something like =@StudentNo but this will not work, Hopefully I’m just missing something simple. Thanks for your time.

[Ramy Mahrous]

Say you've button, when user presses on it fills the grid with the data filtered with your critria, OK?

So, on you button click event handler write this code

this.table1TableAdapter.FillBy(this.myDataSet.myTable, new System.Nullable<int>(((int)(System.Convert.ChangeType(textbox1.Text, typeof(int))))));

N.P: My critria was integer value
sorry but I don't know VB.NET code :)

[nerden]

Even with a little modification im not sure that will work, this query has got to have an eliment in the QueryBuilder which the program can pass arguments to. thank you anyhoo

[cellus205]

Right, you should use the =@studentno for your query, so it will be something like

SELECT StudentName FROM StudentTable
WHERE StudentNo = @StudentNo

Where StudentNo is the name of the student number column in your access database , then when you need to call the query it will be

StudentName.Text = StudTableAdapter.StudName(txtStudentNo.text)

Where StudName is the name of your query. Im still pretty new to VB too, but I just did something similar.

[nerden]

Thank you very much "cellus205", sorry it took so long to reply, wich finishing uni and stuff.

cheers

[nerden]

RIGHT, incase anyone ever finds this thread again, microsoft had hidden the bit i was looking for in the depths of hell.
Step one
go to the DataSetDesigner
right click your DataTable
fill stuff out as you would making a normal query using a @xxxxxx as a variable where the x's are the name of the column your want to query (Where StudentNo =@StudentNo) was my line

finish the query ignore the warning about errors on '@'
click on "fillBy,GetDataByxxxxxxx" then go to the proporties pane and under parameters
add a parameter for each of the variables you added in the query

<to filter a DataGridView>
then in your forms code
grdEpLst.DataSource = DataTable1TableAdapter1.GetDataByStudent(txtSearchFilter.text)