I want to set dropdown values selected on load based on values. Values may change each time dropdown is loaded

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I want to set dropdown values selected on load based on values. values may change each time dropdown is loaded

Values coming from another page I get that values by using request.query string and put that values in variables now whatever variable contain values that values should be selected in dropdown (that values text should be display (selected) in dropdown)

LoadDrowpDown(int ApprovalAnnexureId)

I have function as
I am passing values here

and Bind as

ddlAnnexure.SelectedValue = ApprovalAnnexureId.ToString();

but is is not binding that values

I have called function on page load as

LoadDrowpDown(ApprovalAnnexureId);

What I have tried:

void LoadDrowpDown(int ApprovalAnnexureId)
    {
         Approval_annexure objApproval_annexure = new Approval_annexure();
        DataTable dtApproval_annexure = new DataTable();
        dtApproval_annexure = objApproval_annexure.GetLists();
        ddlAnnexure.DataSource = dtApproval_annexure;
        ddlAnnexure.DataValueField = "Approval_Annexure_Id";
        ddlAnnexure.DataTextField = "Annexure_Name";
        ddlAnnexure.SelectedValue = ApprovalAnnexureId.ToString();
        ddlAnnexure.DataBind();
    }

Posted 3-Nov-18 6:01am

paul_vin

Updated 6-Nov-18 15:15pm

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Vincent Maverick Durano · Answer 1 · 2018-11-06T10:53:00

Here you go:

C#

protected void Page_Load(object sender, EventArgs e){
        if (Request.QueryString["SomeKeyHere"] != null){
            LoadDrowpDown(int ApprovalAnnexureId);
        }
}


void LoadDrowpDown(int ApprovalAnnexureId)
{
        Approval_annexure objApproval_annexure = new Approval_annexure();
        DataTable dtApproval_annexure = new DataTable();
        dtApproval_annexure = objApproval_annexure.GetLists();
        ddlAnnexure.DataSource = dtApproval_annexure;
        ddlAnnexure.DataValueField = "Approval_Annexure_Id";
        ddlAnnexure.DataTextField = "Annexure_Name";
        ddlAnnexure.DataBind();

	//pre select here
	if(ApprovalAnnexureId > 0){
		ListItem item = ddlAnnexure.Items.FindByValue(ApprovalAnnexureId.ToString());
		if (item != null)
		{
     			ddlAnnexure.ClearSelection();
     			item.Selected = true;
		}
	}
}

chenghuichao · Answer 2 · 2018-11-06T15:16:00

Solution 2

sounds like IsPostBack issue:

C#

if (!IsPostBack)

    {

        LoadDrowpDown(ConvertToInt32(Request["SomeKeyHere"]));

    }

Posted 6-Nov-18 15:16pm

chenghuichao