Index was out of range. Must be non-negative and less than the size of the collection ?

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Index was out of range. Must be non-negative and less than the size of the collection.
I'm trying to get the id of gridwiew row and use the link button to print the row info in another page and it keeps give me this error ,
any help please

ASP.NET

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True"
    AutoGenerateColumns="False" DataSourceID="SqlDataSource1">
<Columns>
  <asp:BoundField DataField="emp_fname" HeaderText="emp_fname"
      SortExpression="emp_fname" />
  <asp:BoundField DataField="emp_lname" HeaderText="emp_lname"
      SortExpression="emp_lname" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
    ConnectionString="<%$ ConnectionStrings:dbConnectionString1 %>"
    SelectCommand="SELECT [emp_fname], [emp_lname] FROM [employee] WHERE ([com_id] = @com_id)">
<SelectParameters>
    <asp:SessionParameter Name="com_id" SessionField="comid" Type="Int32" />
</SelectParameters>

</asp:SqlDataSource>

C#

protected void LinkButton1_Click(object sender, EventArgs e)
{

    LinkButton lnkbtn = sender as LinkButton;
    //getting particular row linkbutton
    GridViewRow gvrow = lnkbtn.NamingContainer as GridViewRow;
    //getting email_id of particular row
    int email_id = Convert.ToInt32(GridView1.DataKeys[0].Value.ToString());
    string email_from = gvrow.Cells[0].Text;
    Response.Redirect("~/readmsg.aspx?email_id=" + email_id);
    con.Close();
}

Posted 15-Jun-12 6:58am

Leena00

Updated 28-Jun-20 4:41am

Tim Corey

v2

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Comments

Sergey Alexandrovich Kryukov 15-Jun-12 13:31pm

In what line?
--SA

Leena00 15-Jun-12 13:52pm

In this line

int email_id = Convert.ToInt32(GridView1.DataKeys[0].Value.ToString());

1 solution

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sander Rossel · Accepted Answer · 2012-06-15T08:16:00

The exception that is thrown when an attempt is made to access an element of an array with an index that is outside the bounds of the array.[^]
It seems your grid has no DataKeys[^]. Are you sure your GridView[^] is filled with records? Because that doesn't seem to be the case.
Anyway, simply debugging and stepping through the code should reveal if GridView.DataKeys[0] does actually exist.

Edit:
You should always use the Count or Length (extension) method or Property of collections to make sure there are enough objects in the collections before trying to access one.
Consider the following:

C#

if (GridView.DataKeys.Count > 0)
{
    // Your code accessing the 1st element in the collection goes here.
    // Remember that DataKeys[0] returns the first element (count >= 1).

    // This is safe, since Count is bigger than 0, so there is at least one item. 
    GridView.DataKeys[0].Value.ToString()
    // Might still throw an exception, since you're not sure if count = 2.
    GridView.DataKeys[1].Value.ToString()
}

Hope that helps :)

Index was out of range. Must be non-negative and less than the size of the collection ?

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Index was out of range. Must be non-negative and less than the size of the collection ?

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