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Programmatically setting gridview selected value

I would ilke to set the selected value of my gridview based on the selected value of a dropdown control.

I added the attached code to my selectedindex changed  event for my dropdown.  However, it says that the 'Selected Value' for my gridview is read only.

How can I get around this?

If ddl_projectlist.SelectedValue <> -1 Then
            gvProjects.DataBind()
            gvProjects.SelectedValue = ddl_projectlist.SelectedValue

        End If

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imstac73
Asked:
imstac73
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1 Solution
 
gamarrojgqCommented:
Hi,

The SELECTEDVALUE property of a GridView is REALONLY and you cannot change that. What are you trying to do? that the Row that have that Value shows as Selected?

If that is what you want, you have to assign the property SELECTEDINDEX with the Row Number for the Value Selected in your DropDown like hits

gbProjects.SelectedIndex  =  2 'Put here the Real Row Number  
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Mohamed AbowardaSoftware EngineerCommented:
Are you trying to update the database from DataGridView?

Check this: http://social.msdn.microsoft.com/forums/en-US/netfxcompact/thread/4db2b139-30ce-44a6-b195-9fad095f6b1c/
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imstac73Author Commented:
Yes, I want to make the row that has the selected value of the dropdown list the selected row in the gridview.  How do I get the row number of the gridview that corresponds to the value selected in the dropdown list?

My dropdown list value is my projectid field which is also a datakey for the gridview.
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gamarrojgqCommented:
You can iterate the grid Rows like this

  For n As Integer = 0 To gvProjects.DataKeys.Count - 1
            If gvProjects.DataKeys(n).Value = ddl_projectlist.SelectedValueThen
                gvProjects.SelectedIndex = n
                Exit for
            End If
        Next
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imstac73Author Commented:
Thanks, this code worked to select the current row.  I also have a formview that needs to also go to the project record that is selected.  I tried to change the code above to use it for the formview as well but I'm a little confused on the correct code.

 For n As Integer = 0 To fvProjects2.DataItemCount - 1
                If fvProjects2.DataKey(n).Value = ddl_projectlist.SelectedValue Then
                    fvProjects [ Not sure what goes here]= n
                    Exit For
                End If
            Next
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gamarrojgqCommented:
ok, the FormView control would not allow you to do something like that since it does not have a property or method to jump to a specific record.

What kind of Datasource are you using to the FormView? a Datatable? a BindingSource?
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gamarrojgqCommented:
ok, if you are using PAGING in your formview you can use PageIndex to select the record you want to show like this


 For n As Integer = 0 To fvProjects2.DataItemCount - 1
                If fvProjects2.DataKey(n).Value = ddl_projectlist.SelectedValue Then
                    fvProjectsPageIndex =  n
                    Exit For
                End If
            Next

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imstac73Author Commented:
On the line of code: If fvProjects2.DataKey(n).Value = ddl_projectlist.SelectedValue


I get this error:
Public member 'Value' on type 'Long' not found.
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gamarrojgqCommented:
Ok, sorry for that, what are you using as a DataSource of the FormView? a dataTable? a dataset? a SqlDatasource?

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imstac73Author Commented:
a SqlDatasource
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gamarrojgqCommented:
ok try this, is a little odd but it should work


        Dim rowView As DataRowView
        ProductsFormView.DataBind()

        For n As Integer = 0 To ProductsFormView.DataItemCount - 1
            ProductsFormView.PageIndex = n
            ProductsFormView.DataBind()
            rowView = CType(ProductsFormView.DataItem, DataRowView)
            If rowView("Data").ToString = ddl_projectlist.SelectedValue.ToString Then
                Exit For
            End If
        Next
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imstac73Author Commented:
It did not recognize the DataRowView so I changed it to Data.DataRowView but when I run it I get the following error:

Data is neither a DataColumn nor a DataRelation for table DefaultView.

on line If rowView("Data").ToString = ddl_projectlist.SelectedValue.ToString Then
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gamarrojgqCommented:
ok, sorry for ask, but did you change ProductsFormView for fvProjects2? and also change the Ctype call?

 Dim rowView As Data.DataRowView
        fvProjects2.DataBind()

        For n As Integer = 0 To fvProjects2.DataItemCount - 1
            fvProjects2.PageIndex = n
            fvProjects2.DataBind()
            rowView = CType(fvProjects2.DataItem, Data.DataRowView)
            If rowView("Data").ToString = ddl_projectlist.SelectedValue.ToString Then
                Exit For
            End If
        Next
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imstac73Author Commented:
Yes
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gamarrojgqCommented:
ok, if the DataSource of your FormView is the same of the GridView, try to use the same n value that you use for the gridview in the FormView, so after this

For n As Integer = 0 To gvProjects.DataKeys.Count - 1
            If gvProjects.DataKeys(n).Value = ddl_projectlist.SelectedValueThen
                gvProjects.SelectedIndex = n
                Exit for
            End If
        Next

Add this
           'USE THE SAME N VALUE OF THE GRIDVIEW ON THE FORMVIEW
            fvProjects2.PageIndex = n
            fvProjects2.DataBind()

Try it and let me know
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imstac73Author Commented:
My datasource is different.
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gamarrojgqCommented:
ok, sorry my bad, in the previous code the error is that in my environment I used DATA as the column to check for the selectedvalue, but in your environment you have to put the column that you use, so it will be like this

 Dim rowView As Data.DataRowView
        fvProjects2.DataBind()

        For n As Integer = 0 To fvProjects2.DataItemCount - 1
            fvProjects2.PageIndex = n
            fvProjects2.DataBind()
            rowView = CType(fvProjects2.DataItem, Data.DataRowView)
            If rowView("TheNameOrYOURColumn").ToString = ddl_projectlist.SelectedValue.ToString Then
                Exit For
            End If
        Next
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imstac73Author Commented:
Thanks so much this worked great!
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