ParameterCollection.RemoveAt Method (Int32)


The .NET API Reference documentation has a new home. Visit the .NET API Browser on to see the new experience.

Removes the Parameter object at the specified index from the ParameterCollection collection.

Namespace:   System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

public void RemoveAt(
	int index


Type: System.Int32

The index of the Parameter to remove.

Use the RemoveAt method to remove the Parameter object at the specified index from the collection.

The following code example demonstrates how to use the RemoveAt method to remove a Parameter object from a ParameterCollection collection at a specific location. In this example, several QueryStringParameter objects are added to a SelectParameters collection, one QueryStringParameter object is removed from the collection, and the order of the collection is printed when the page loads.

<%@page Language="C#" %>
<SCRIPT runat="server">
private void Page_Load(object sender, EventArgs e) {

    SqlDataSource aSqlDataSource = new SqlDataSource();

    // Security Note: The SqlDataSource uses a QueryStringParameter,
    // Security Note: which does not perform validation of input from the client.

    QueryStringParameter qs1 =
        new QueryStringParameter("QueryStringParam1","requestfield1");


    QueryStringParameter qs3 =
        new QueryStringParameter("QueryStringParam2","requestfield2");


    // Insert another QueryStringParameter with the same name as the previous parameter.
    aSqlDataSource.SelectParameters.Add( new QueryStringParameter("QueryStringParameter2","requestfield3") );

    // There are two parameters named QueryStringParam3. Use the
    // RemoveAt method to remove the last element from the collection.
    aSqlDataSource.SelectParameters.RemoveAt( (aSqlDataSource.SelectParameters.Count - 1) );

    // Iterate through the ParameterCollection and print out the
    // names of the Parameters contained by it.
    foreach (Parameter aParameter in aSqlDataSource.SelectParameters) {
        Response.Write(aParameter.Name + "<BR>");
        QueryStringParameter qsptemp = (QueryStringParameter) aParameter;
        Response.Write("QueryStringField is " + qsptemp.QueryStringField + "<BR>");

.NET Framework
Available since 2.0
Return to top