Cannot implicitly convert type 'string' to 'System.Web.UI.WebControls.TextBox'

[haleemasher]

When i run the code below it show error in bold line of code that "Cannot implicitly convert type 'string' to 'System.Web.UI.WebControls.TextBox'" as i m new to C# programming so i can't resolve it.

protected void gvCouponDetails_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
int id;
int CouponTypeID;
int Serial_Start;
int serial_End;
TextBox CouponName;
DateTime TranDate;

GridViewRow row = gvCouponDetails.Rows\[e.RowIndex\];

id = int.Parse(((Label)row.Cells\[0\].FindControl("lblID")).Text);
TranDate = DateTime.Parse(((TextBox)row.Cells\[2\].FindControl("tbDate")).Text);

** CouponName =((DropDownList)row.Cells[3].FindControl("ddlCoupon")).SelectedValue.ToString();**
Serial_Start= int.Parse(((TextBox)row.Cells[4].FindControl("tbSerialStart")).Text);
serial_End = int.Parse(((TextBox)row.Cells[5].FindControl("tbSerialEnd")).Text);

string UpdateQuery = string.Format("update Coupon\_Info Set ReceivingDate = '{0}',Coupon\_TypeID = {1}, Serial\_Start={2},Serial\_End={3} where ID= {4}",TranDate.ToString(),CouponTypeID.ToString(),Serial\_Start.ToString(),serial\_End.ToString(),id.ToString());
DAL da = new DAL();
da.ConnectionString = ConfigurationManager.AppSettings\["ConnectionString"\].ToString();
int i= da.ExecuteNonQuery(CommandType.Text, UpdateQuery, null);
gvCouponDetails.EditIndex = -1;
boundgridview();

}

ASP code is

<asp:GridView ID="gvCouponDetails"
runat="server"
AutoGenerateColumns="false"
onrowcancelingedit="gvCouponDetails_RowCancelingEdit"
onrowediting="gvCouponDetails_RowEditing"
onrowupdating="gvCouponDetails_RowUpdating"
DataKeyNames="ID"
style="top: 521px; left: 276px; position: absolute; height: 143px; width: 704px">
<Columns>

        <asp:CommandField   ButtonType="Button"
                            CancelText="C"
                            ShowCancelButton="true"
                            EditText="E"
                            ShowEditButton="true"
                            ControlStyle-Width="15px"
                            ControlStyle-Font-Size="10px"
                            ControlStyle-ForeColor="Blue"
                            UpdateText="U"  />

            


            
            <asp:TemplateField HeaderText="Coupon Name">

[Abhijit Jana]

haleemasher wrote:

TextBox CouponName;

Why CoupanName is TextBox Type ?

haleemasher wrote:

CouponName =((DropDownList)row.Cells[3].FindControl("ddlCoupon")).SelectedValue.ToString();

Use

String CouponName;
CouponName =((DropDownList)row.Cells[3].FindControl("ddlCoupon")).SelectedValue.ToString();

Abhijit Jana | Codeproject MVP Web Site : abhijitjana.net Don't forget to click "Good Answer" on the post(s) that helped you.

[haleemasher]

I change my code as u suggest but now it show this error in same line of code**'System.Web.UI.Control' does not contain a definition for 'SelectedValue' and no extension method 'SelectedValue' accepting a first argument of type 'System.Web.UI.Control' could be found**

CouponName =(DropDownList)row.Cells[3].FindControl("ddlCoupon").SelectedValue.ToString();

[ali_reza_zareian]

I think you forgot to use text property. CouponName.text="";

[haleemasher]

thnx 4 suggestion but i want to update a gridview and CouponName is my dropdownlist in gridview which i want to update.

[Christian Graus]

haleemasher wrote:

as i m new to C# programming

OK, well, given that the error message is in plain english, I'm not sure what to suggest. If you knew how to program, I'd suggest you break this up into as many lines as you can and step through in the debugger to work out what is going wrong. As you don't know C#, I assume you're either in a class, or teaching yourself. If you're in a class, you should talk to your teacher. If you're teaching yourself, buy a basic book on C#, BEFORE you try to learn ASP.NET. And if this is paid work, you are an utter disgrace, and should tell your client right now that you are stealing from them. If you work for a company, I'd expect them to go broke soon, hiring people like you. Your best way forward would be to buy a C# book and work through it, in the hope that when they fail and you look for another programming job, you find yourself actually capable of doing some programming and/or understanding basic error messages. I assume you didn't write this code. Whoever did, isn't very good. It's horrible. CouponName =((DropDownList)row.Cells[3].FindControl("ddlCoupon")).SelectedValue.ToString(); There are at least four ways that this code could blow up, it should be on at least 4 lines, with extra code to check the assumptions being made.

Christian Graus Driven to the arms of OSX by Vista. Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

[padmanabhan N]

haleemasher wrote:

CouponName =((DropDownList)row.Cells[3].FindControl("ddlCoupon")).SelectedValue.ToString();

insead use: string CouponName = string.empty; CouponName = ((DropDownList)row.Cells[3].FindControl("ddlCoupon")).Text;

Padmanabhan My Articles: Articles[^] My latest Article: Word Automation[^]

[Christian Graus]

I have no idea how a textbox is getting involved in his code, but I suspect that Cells[3] has a textbox in it, instead of a drop down. He needs to break this in to steps and use the debugger to work out what is wrong. If he's capable of it.

Christian Graus Driven to the arms of OSX by Vista. Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

[Sendilkumar M]

CouponName will always contains some string value.Casting it to TextBox is meaningless.If you want to have TextBox based on the value of CouponName use some control logic to get it done.

M.Sendilkumar

[harshangrana]

Try this CouponName.Text =((DropDownList)row.Cells[3].FindControl("ddlCoupon")).SelectedValue.ToString();