Finding row position of a Data Table

Ive searched everywhere but cannot seem to find out how to find the row position/index in a data table, using a value from another table.

For example, I use the row position from Linkingtable1 to get my value for CustomerID, but i want to use the CustomerID to search the CustomerTable for its row position, in order to show the Customers Name in a text box, As currently when loading the textbox shows the customerID. I understand the code to get the names from the rows in the datatable, its just finding the row position of the customerID.

Bit of a dodgy explanation, but hope you kinda understand

Thanks!

You can use DataTable.DefaultView.Find or DataTable.DefaultView.RowFilter to find the desired row.

I get two different errors when trying to use each of those ways.
For Find i get:

Code:

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Find finds a row based on a Sort order, and no Sort order is specified.

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For RowFilter i get:

Code:

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Index was outside the bounds of the array.

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I was assuming CustomerID is the primary key of your table.

But the filter should work anyways. What code are you using?

my coding's not the best, but ill post some up now

Code:

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cboCustomer.Text = _
            dttblLinking.Rows(m_rowPosition)("CustomerID").ToString()
RowPos = dttblCustomer.DefaultView.RowFilter(cboCustomer.SelectedValue)
txtName = dttblCustomer.Rows(RowPos)("CustomerName").ToString()

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Code:

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dttblCustomer.DefaultView.RowFilter = "CustomerID=" & cboCustomer.SelectedValue
If dttblCustomer.Rows.Count >0 Then txtName = dttblCustomer.Rows(0)("CustomerName").ToString()

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wow, thanks, works a treat, however having a slight issue that i had more than one customer in the combo box, but the filtering seems to leave me with just the Customer that has been selected. Thanks again

Quote:

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Originally Posted by rushy

wow, thanks, works a treat, however having a slight issue that i had more than one customer in the combo box, but the filtering seems to leave me with just the Customer that has been selected. Thanks again

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You can modify the filter according to your needs.
It is basically the WHERE part of your SQL statement.

e.g.

Code:

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dttblCustomer.DefaultView.RowFilter = "CustomerID=1 OR CustomerID=2 OR CustomerID=3"

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If it would be getting too complex, then it is always better to fill your datatable with only rows of your interest from your database with appropriate SQL query.

The problem i have is that it doesnt seem to filter down the customers, it will just show the customer in row(0) and therefore doesnt change at all when i change the number in the combo box. This is the reason i was looking for a little bit of help in getting the row position of the customername with customerid = combobox

your help so fars much appreciated though! :)

ok.. I see. You have multiple records with same customer ID?

The filter will filter out all the customers. But since we are showing only 0th row in the textbox it looks like only one record is slected

You can try something like this:

Code:

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For each dr as DataRow in dttblCustomer
txtName.Text  &= dr("CustomerName")
Next

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Quote:

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Originally Posted by rushy

The problem i have is that it doesnt seem to filter down the customers, it will just show the customer in row(0) and therefore doesnt change at all when i change the number in the combo box. This is the reason i was looking for a little bit of help in getting the row position of the customername with customerid = combobox

your help so fars much appreciated though! :)

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I want to tell you, that in the datasources tab, you make a connection with your database server and from there for example, you can drag the customer ID from the customer table to the CustomerID textbox and all the other fields that you want to link in your textboxes that you want to select the primary key from as your source, and then for example, if you have a related table, under the hierarchy of relations you select the table of the other table that you want to link for example Orders to the combobox, and it will take care of the DisplayMember (this is what you want to show inside the comboxBox) and the ValueMember (This is the CustomerID that you want to save in the other table that you want)

also for example, if you want to find a member or customer, then in the selected_change event of the comboBox, you write the code to call a Query for the CustomerTableAdapter.FillByCustomerID(CustomerDataTable, ComboBox.SelectedValue) This way it will take you directly to the record that you want to display through the bindingsource that is already automatically link with the previous drag that you performed.

Hope this works for you, there are many ways of doing this task, also using the datatable.select("CustomerID = '" & comboBox.SelectedValue & "'")

Good Luck

@toalopez, this thread is 2 years old, and replying to this thread will help no one. The OP probably already has had his problem resolved, or the question is not relevant to him any more. Please avoid re-opening such old threads.