How to fix the error - "Value cannot be null. Parameter name: format"

Question

Dear All,

I encountered an error "Value cannot be null. Parameter name: format". Since the line number is 0 in the error list, clicking on the error line can't jump to the code. Could anybody tell me how to fix it?

Answer 1

Hi @BenTam-3003 , Welcome to Microsoft Q&A,

If you are referring to Schedule_Form.cs, I checked your designer.cs.

Found that your code is missing PerformLayout();

The entire modified code is:

namespace NewTims
{
    partial class DaySchedule_Form
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(DaySchedule_Form));
            SuspendLayout();
            // 
            // DaySchedule_Form
            // 
            AutoScaleDimensions = new SizeF(7F, 15F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(494, 195);
            Icon = (Icon)resources.GetObject("$this.Icon");
            Name = "DaySchedule_Form";
            Text = "Day Schedule";
            ResumeLayout(false);
        }

        #endregion
    }
}

Best Regards,

Jiale

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Answer 2

I get the same error, but for different reasons. My app used to work fine, but now the form will not load, and I get the error as soon as I open the project:

I switched to Windows 11 lately and had to download VS Community 2022 again. I think something is wrong with my CodeDom Designer, but I am not sure which component I need to install. Any help is appreciated.