主题：[求助]明明都是字符串却弹出到类型“Double”的转换无效

代码操作如下，字段都是字符类型的

明明都是字符串，但是却弹出从字符串“gsmc”到类型“Double”的转换无效。请问什么问题啊

Dim Texts() As String = {"gsmc","gstel","gsmail","gslxdz"}
Dim ct() As String ={"TextBox1","TextBox2","TextBox3","TextBox4"}
Dim cmd As New SQLCommand
cmd.C

For  i As Integer  = 0 To Texts.Length-1
    cmd.CommandText = "Sele ct     [jbszbm] from {ck_sz_ckjbsz} where jbszbm= '" & Texts(i) & "' "
    If cmd.ExecuteScalar()>0 Then
        cmd.CommandText = "UPDA TE     [ck_sz_ckjbsz] SET jbszzd = '" & e.Form.Controls(ct(i)).value & "' WHERE [jbszbm] = '" & Texts(i) & "'"
        cmd.ExecuteNonQuery()
    Else
        cmd.CommandText = "Ins ert Into [ck_sz_ckjbsz] (jbszbm,jbszzd) Values('" & Texts(i) & "','" &  e.Form.Controls(ct(i)).value & "')"
        cmd.ExecuteNonQuery()
    End If
Next