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error on datagrid- unknown webcontrol error

I am getting the following error:
No mapping exists from object type System.Web.UI.WebControls.TemplateField to a known managed provider native type.

I have 2 datagrids.  one datagrid is a result of a search and the the column I am trying to obtain from datagrid one is [4].  in my select statement for the 2nd datagrid, a match is found in the designated table.  however, when i select match, I get the above error.  the error is supposedly on the datasource, but upon closer examination, I think it's my: commshow.Parameters.AddWithValue("@shownum", appReqsGrid.Columns[4]);
how can I obtain the value from column 4 in the first datagrid (data is passed through a link - find match) to become part of my query in my second datagrid?

here's the code from the second datagrid:

=====some of the code====

string bon = ConfigurationManager.ConnectionStrings["RevisedTapeLibrary"].ConnectionString;
                   SqlConnection connsho = new SqlConnection(bon);
                   SqlCommand commshow = new SqlCommand("select Barcode, ItemID, ShowTitle, Format, Library, ID, ShowID from view_matchShwByRequest WHERE ShowID = @shownum", connsho);
                   commshow.Parameters.AddWithValue("@shownum", appReqsGrid.Columns[4]);

                    appReqsGrid.DataSource = commshow.ExecuteReader();
                    //actualMatchGrid.DataSource = commshow.ExecuteReader();                  
                    actualMatchGrid.AllowSorting = true;
                    actualMatchGrid.AutoGenerateColumns = false;
                    actualMatchGrid.DataKeyNames = new string[] { "ShowID" };

                    BoundField shw1 = new BoundField();
                    BoundField shw2 = new BoundField();

                    shw1.HeaderText = "Record";
                    shw1.DataField = "ShowID";
                    shw1.ReadOnly = true;

                    shw2.HeaderText = "Show";
                    shw2.DataField = "ShowTitle";
                    shw2.ReadOnly = true;

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1 Solution
Bob LearnedCommented:
If you are trying to get a value from a GridView, then you need to get it from a row's cell, not the column:


synergeticsoulAuthor Commented:
ok  so would it be this.appReqsGrid.Rows[0].Cells[4]  because it is the 4th cell that I am trying to retrieve the information?
Bob LearnedCommented:
That would be my guess, but you are the one who has to tell me.

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synergeticsoulAuthor Commented:
i get the same error:
No mapping exists from object type System.Web.UI.WebControls.BoundField to a known managed provider native type.

error on : actualMatchGrid.DataSource = commshow.ExecuteReader();
synergeticsoulAuthor Commented:
i have to find the value of the selected row from grid 1 and show that value in the select statement for grid 2.

when i try to put a value on the datagrid, also tried:  int showtheid= appReqsGrid.DataKeys[4];  i also get an error.
Bob LearnedCommented:
It sounds like you haven't set up the grid correctly.


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