Gridview with textboxes and SQL Server database - asp.net

Question

I'm working on a web app using Visual Studio and VB.net. I have a grid view with textboxes. When I try to get the string from the textboxes of each row to update my database, it is empty though there is something in.
I want to know why
Here is the declaration of the textboxes in the gridview ;
<asp:TemplateField HeaderText="TpNote">
<ItemTemplate>
<asp:TextBox ID="TpTextBox" runat="server" width="50px" BorderWidth="0px"></asp:TextBox>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" />
</asp:TemplateField>
<asp:TemplateField HeaderText="CiNote">
<ItemTemplate>
<asp:TextBox ID="CiTextBox" runat="server" width="50px" BorderWidth="0px" AutoPostBack="False" CausesValidation="False" ClientIDMode="Inherit"></asp:TextBox>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" />
</asp:TemplateField>
<asp:TemplateField HeaderText="CfNote">
<ItemTemplate>
<asp:TextBox ID="CfTextBox" runat="server" width="50px" BorderWidth="0px"></asp:TextBox>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" />
</asp:TemplateField>
And here is the code behind:
Protected Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Dim rqt1, rqt2, rqt3, rqt4 As String
con.Open()
Dim i As Integer
i = 0
Try
For Each row As GridViewRow In GridView1.Rows
Dim t As TextBox
Dim ccNote As String
t = CType(row.Cells(i).FindControl("CcTextBox"), TextBox)
ccNote = t.Text
Dim t1 As TextBox
Dim tpNote As String
t1 = CType(row.Cells(i).FindControl("TpTextBox"), TextBox)
tpNote = TextBox2.Text
Dim t2 As TextBox
Dim ciNote As String
t2 = CType(row.Cells(i).FindControl("CiTextBox"), TextBox)
ciNote = t2.Text
MsgBox(t2.Text)
Dim t3 As TextBox
Dim cfNote As String
t3 = CType(row.Cells(i).FindControl("CfTextBox"), TextBox)
cfNote = t3.Text
Dim matricule As String
Try
matricule = GridView1.Rows(i).Cells(0).Text
Catch ex As Exception
End Try
i = i + 1
rqt1 = "Update INSCRITMODULE set CcNote ='" + ccNote + "' where (INSCRITMODULE.Matricule)='" + matricule + "'"
rqt2 = "Update INSCRITMODULE set TpNote ='" + tpNote + "' where (INSCRITMODULE.Matricule)='" + matricule + "'"
rqt3 = "Update INSCRITMODULE set CiNote ='" + ciNote + "' where (INSCRITMODULE.Matricule)='" + matricule + "'"
rqt4 = "Update INSCRITMODULE set CfNote ='" + cfNote + "' where (INSCRITMODULE.Matricule)='" + matricule + "'"
Dim commande1 As New SqlCommand With {
.CommandText = rqt1,
.Connection = con
}
commande1.ExecuteNonQuery()
Dim commande2 As New SqlCommand With {
.CommandText = rqt2,
.Connection = con
}
commande2.ExecuteNonQuery()
Dim commande3 As New SqlCommand With {
.CommandText = rqt3,
.Connection = con
}
commande3.ExecuteNonQuery()
Dim commande4 As New SqlCommand With {
.CommandText = rqt4,
.Connection = con
}
commande4.ExecuteNonQuery()
Next
con.Close()
Catch ex As Exception
End Try
End Sub
Thank you

Answer 1

I would suggest first debug the code and try to make sure if each asp textbox value is coming to t1,t2,..... to backend and then we can figure out rest of the thing.

Answer 2

I would suggest,
<asp:TemplateField HeaderText="TpNote">
<ItemTemplate>
<asp:TextBox ID="TpTextBox" runat="server" width="50px"
Text ='<%#Eval("CCNote")' BorderWidth="0px"></asp:TextBox>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" />
</asp:TemplateField>
similarly bind values all textboxes which you want to get value in code behind.
and then find textbox and get its value