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POasp.net update gridview problem
 

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  1. POasp.net update gridview problem
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    <p>I have a problem with handling the function to update my gridview. Until now I've been using DataSource control but this time I need to build everything from scratch. I want to be able to update just the very last data column of the gridview. My problems are: 1) When I click edit button all data fields in the row convert into textboxes - I would like only last one to do so 2) When I click update I get "Object reference not set to an instance of an object." error, and it seems that "TextBox tProgress = (TextBox)grdMilestones.Rows[e.RowIndex].Cells[3].FindControl("mstCompletition");" just can't find a correct value because when I substitute it with a number it works fine.</p> <p>This is my gridview</p> <pre><code>&lt;asp:GridView ID="grdMilestones" runat="server" Width="940px" DataKeyNames="mstNo" OnRowEditing="grdMilestones_RowEditing" OnRowCancelingEdit="grdMilestones_RowCancelingEdit" OnRowUpdating="grdMilestones_RowUpdating" AutoGenerateColumns="False" CssClass="milestonesGrid"&gt; &lt;Columns&gt; &lt;asp:BoundField DataField="proName" HeaderText="Project Name" /&gt; &lt;asp:BoundField DataField="mstDescription" HeaderText="Milestone Description" /&gt; &lt;asp:BoundField DataField="mstPersResp" HeaderText="Milestone Leader" /&gt; &lt;asp:BoundField DataField="mstCompletition" HeaderText="Progress" DataFormatString{0:F1}%" /&gt; &lt;asp:CommandField ButtonType="Button" ShowEditButton="true" EditText="Update progress" /&gt; &lt;/Columns&gt; &lt;/asp:GridView&gt; </code></pre> <p>And a code behind</p> <pre><code>protected void grdMilestones_RowUpdating(object sender, GridViewUpdateEventArgs e) { int id = Int32.Parse(grdMilestones.DataKeys[e.RowIndex].Value.ToString()); TextBox tProgress = (TextBox)grdMilestones.Rows[e.RowIndex].Cells[3].FindControl("mstCompletition"); int prog = Convert.ToInt32(tProgress.Text.Trim()); //ds.Rows[row.DataItemIndex]["mstCompletition"] = ((TextBox)(row.Cells[1].Controls[0])).Text; string updateSQL = "UPDATE milestonesPM SET mstCompletition = @mstCompletition WHERE mstNo = @mstNo"; SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(updateSQL, con); cmd.Parameters.Add("@mstNo", SqlDbType.Int).Value = id; cmd.Parameters.Add("@mstCompletition", SqlDbType.SmallInt).Value = prog; con.Open(); cmd.ExecuteNonQuery(); grdMilestones.EditIndex = -1; grdMilestones.DataBind(); con.Close(); fillGrid(); } </code></pre> <p>Regards</p> <p>Bartosz</p>
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