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PODelete Query in asp.net using C#
 

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    <p>In my application am allowing the user to delete an entire row from the grid view when he clicks on delete button. but am getting an error in delete query. Error is "Invalid column name" my code is as follows:</p> <pre><code>&lt;asp:GridView ID="GridView1" runat="server" DataKeyNames="Username" AutoGenerateColumns="false" OnPageIndexChanging="GridView1_PageIndexChanging" OnRowDeleting="GridView1_RowDeleting" &gt; &lt;Columns&gt; &lt;asp:BoundField DataField="UserName" HeaderText="UserName" ReadOnly="true" /&gt; &lt;asp:BoundField DataField="Name" HeaderText="Name" ReadOnly="true" /&gt; &lt;asp:BoundField DataField="Password" HeaderText="Password" ReadOnly="true" /&gt; &lt;asp:BoundField DataField="Email" HeaderText="Email" ReadOnly="true" /&gt; &lt;asp:CommandField ShowDeleteButton="true" /&gt; &lt;/Columns&gt; &lt;/asp:GridView&gt; </code></pre> <p>C# code is:</p> <pre><code>SqlConnection conn = new SqlConnection(@"Data Source=CHINNU-PC\SQLEXPRESS; Initial Catalog= CarDetails; Integrated Security=True"); protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { gvbind(); } } protected void gvbind() { conn.Open(); SqlCommand cmd = new SqlCommand("Select * From [User]", conn); SqlDataAdapter da = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); da.Fill(ds); conn.Close(); if (ds.Tables[0].Rows.Count &gt; 0) { GridView1.DataSource = ds; GridView1.DataBind(); } } public void Delete(string UserName) { string sql = "Delete From [User] Where UserName=" + UserName; conn.Open(); SqlCommand cmd = new SqlCommand(sql, conn); cmd.ExecuteNonQuery(); conn.Close(); conn.Dispose(); } protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e) { Delete(GridView1.DataKeys[e.RowIndex].Values[0].ToString()); gvbind(); } </code></pre>
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    1. COSide note: You could write this `(@"Data Source=CHINNU-PC\SQLEXPRESS; Initial Catalog= CarDetails; Integrated Security=True");` like this `(@"Data Source=.\SQLEXPRESS; Initial Catalog= CarDetails; Integrated Security=True");` - see how I replaced the computer name with a .? Now your code wont break if you try to set it up on a computer that isn't called CHINNU-PC.
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      1. USrtpHarry
 

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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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