输入字符串的格式不正确以及如何重命名行标题 datagridview

Question

请编码解决方案并重命名行 header 我的意思是标记我附加的图像文件的颜色 注意：对于笔记，我使用 visual studio 2010

Public Class Form1
    Private Sub btnUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpdate.Click
        dbConnection()
        Dim indexID As Integer
        x = DataGridView1.Rows.IndexOf(DataGridView1.CurrentRow)
        indexID = Convert.ToInt32((DataGridView1.Rows(x).Cells(0).Value.ToString()))

        sql = "UPDATE ITEM SET ITM= '" & txtFname.Text & "',ITC='" & txtLname.Text & "',QOH='" & cbGender.Text & "' WHERE ID=" & indexID & ""

        cmd = New OleDbCommand(sql, conn)
        cmd.ExecuteNonQuery()
        MessageBox.Show("Successfully Updated...", "Update")
        conn.Close()

        'btnReadDatabase_Click(sender, e);
        retrieveALL()
    End Sub
End Class

object reference not set 谢谢 罗伊

Answer 1

Private Sub btnUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpdate.Click
    dbConnection()
    sql = "UPDATE ITEM SET ITM= '" & txtFname.Text & "',ITC='" & txtLname.Text & "',QOH='" & cbGender.Text & "' WHERE ITC='" & txtLname.Text & "'"
    cmd = New OleDbCommand(sql, con)
    cmd.ExecuteNonQuery()
    MessageBox.Show("Successfully Updated...", "Update")
    con.Close()
    PopulateDataGridView()
End Sub